Cheap for them of course.
Insurers would never have agreed to Obamacare if it wasn’t made expensive and a captive market.
Its not free market health insurance no matter what any one tells you.
To be fair, the health insurance market wasn’t free market before Obamacare either. It was free-er, but only by degree.
It was still a monopoly within each State and heavily regulated as to its offerings. You could shop around with insurers outside the State (or country for that matter). The difference was you didn’t have to participate.