An employer can systematically destroy an employee's life and finances if they pull the right levers. In places like the US, employees are often terrified of getting fired or laid off because they'll lose their (and often their entire family's) health insurance. Companies use this (and other leverage) to give crap raises, make employees jump through ridiculous hoops to get promoted (and then deny those promotions anyway), "encourage" employees to take the bare minimum (or no) time off, etc.
And employees have to eat it all, or risk losing their livelihoods. Let's think about that phrase, "losing your livelihood". The fact that it's a common saying really tells us all we need to know. Employers hold the power. If they're caught doing bad things, usually there little to no penalty. Employees sometimes do sneaky things (all those things that you mention) and eventually get fired and/or sent to prison.
This is a common misunderstanding.
If an American loses their job for any reason, they can always keep their current insurance through COBRA. In fact, they don't even need to take any immediate action. If they need healthcare in the month of, or month after, their loss of job, they can go get it and then later on pay their premium to have the insurance retroactively go back in time to cover them. The only difference is that the covered person needs to pay the full premium, while the standard employment agreement has the employer paying a significant portion of the premium.
For people who don't want to stay on their previous employer's plan, the loss of the job is a "qualifying event" which allows them to immediately do things like join their spouse's plan or sign up for an individual "Obamacare" plan through healthcare.gov. There are subsidies based on income to make the premiums manageable for low-income people if they can't afford the market rate.
This is incorrect, it's "for limited periods of time under certain circumstances" [0] (and citizenship is not required).
> they can always keep their current insurance through COBRA. [...] needs to pay the full premium
This is true but vastly underplays the cost. It isn't unusual for "the full premium" to be over a thousand dollars per month [1] (!). They even get to charge you an "administrative fee". Oh, and there's also tax implications.
> For people who don't want to stay on their previous employer's plan, the loss of the job is a "qualifying event" which allows them to immediately do things like join their spouse's plan or sign up for an individual "Obamacare" plan through healthcare.gov.
More likely for people who can't stay on their previous plan because it would bankrupt them. Or if their spouse is not working. What happens if the employee has children/dependents on the plan? Etc, etc.
None of this is easy. Switching insurance changes which doctors are "in network", so at minimum it's significant hassle. At worst, their or a family member's current treatment is only partially or not at all covered.
So, in practice, parent's description is accurate enough.
[0] https://www.dol.gov/general/topic/health-plans/cobra
[1] https://www.investopedia.com/cobra-insurance-cost-7486539
Not your business policing that unless they actively causes reduced output or conflict in the work they do for your business.
nobody can work 16 hours a day and be focused all the time. heck, most people can't even do 8 hours of focused work. i am not paying you to sit on a chair, but to actually pay attention. if you do two full time jobs, you are not doing the work at the required focus.
sure, there may be jobs where that doesn't matter, and there are jobs that are paid full time but aren't actually full time jobs. like a sysadmin in a small company, where our boss told him that his job was to keep the servers running. if he has nothing to do he is welcome to goof off. and in such a job he could also have used the free time to do side jobs, or a second job.
but for most jobs it does matter that you are focused working for the whole time, and if i find out that an employee is doing a second full time job then i will be very much concerned at that persons effectiveness.
some work is not about volume but about quality. and exactly the fact that the work can not be measured is the problem. some work can not be done effectively when you are tired, and some work is even dangerous. driving for example. paying attention to safety and security requires you to be a wake and able to focus.
as a programmer i have good days and bad days, and noone can say whether my work is the best i can manage or is slacking because i have a second job. and if i am spending more than my market rate salary as a programmer affords then i need to change my lifestyle, not get a second job.
in germany for example the laws for the maximum time of work an employee is allowed to do in a day covers all jobs. two full time jobs would simply not be possible because you are required to have 11 hours of break between two workdays.
The impracticality of measuring the productivity is irrelevant.