Seems like it's a ploy to get all the undesirables out of the country, then it's "oops your application was denied, or it takes years to be approved, you can't come back. Sorry not sorry!"
It's pretty normal not to be able to look for work on a tourist visa in most countries - are you suggesting this is unusual? As far as spouses, they used to have an incredibly asinine system where they told you your spouse _could_ work, without sponsorship, if they got a special form, but getting this form was de facto impossible. It was a very Irish approach, in retrospect. The campaign to fix this was, eventually, successful. (https://reformstamp3.wixsite.com/home)
Which is nonsense, it applies to all non immigrant visas such as work visas. But it’s a line you’ll see various people try to claim as if this isn’t devastating to every spouse of a us citizen who now can’t get a greencard without leaving their us based job and family.