Either they already have health problems, were pressured by family (”mom” .. per the ads) to sign up, or are heavily subsidized but will find out they are paying their premiums for nothing ... unless they are really sick and running up bills. If not sick and actually meeting deductibles, I suspect after a couple of months, they’ll quit paying ... especially the guys.
I suspect that when the premiums rise by 20+%, many of the healthy ones will quit paying...