Trump's government repealed the individual mandate penalty, and then the court ruled ruled that in it's new form, it no longer qualified as a tax and was unconstitutional. (Not that this meant anything, since the legality of a fee of $0 doesn't matter.)
The court case as a whole argued that because the GOP changed the ACA in a manner that made part of it (the $0 fee) illegal, the entirety of the ACA should be made illegal.
The fifth circuit agreed with some of the arguments in the case (the fee one), but did not practically change anything about the ACA.
And then SCOTUS, surprising ~everyone, ruled that actually the whole of the ACA is constitutional.
Look at this timeline, and you tell me - who spent years trying to re-introduce the free rider problem, and to break the ACA? Congress, the president, and the plaintiff states... or the fifth circuit, which when presented with a singular, narrow question, ruled that a $0 fee (whatever that is) isn't a tax?
Now, as of 2022, we are in a world where the ACA has been thoroughly litigated, and is still here, with the free rider problem hanging like a millstone over its neck.