In the US, health insurance is largely tied to employment. Health insurance, in a personal economic sense, reduces to being able to pay for healthcare. This policy is largely a left-over of World War II era employment policies. No one is taking healthcare _away_ from anyone (strictly speaking), but the ability to be able to _pay_ for healthcare is reduced to zero when employment ceases. Accessing the safety net is a separate skillset. This skill set becomes more difficult to achieve because the political class does not want to provide healthcare for everyone, only the worthy (their loyal voters).
I grew up in and am still a member of the precariat. I am educated and doing well, but I wear a well-polished pair of golden handcuffs due to how my ability to afford healthcare for myself, and my family, is tied to employment. Politically, I _do not_ like being tied to my employer by such a chain, but my arguments to change the system have been met with quite firm push-back.