According to the German Wikipedia article every Dutch person is required by law to have a "legally defined" healthcare contract. Sounds quite different to the US system.
Under an Obamacare cheapest possible insurance option you're not going to be bankrupted by (for example) a heart attack, but you'll still be paying the bill for a long time. That ignores hospitals like SF general that charge you directly (and are out of network) so you can still be trivially bankrupted.
The rules were tightened up, and without any explict legal language banning them, insurance companies dropped such policies because they knew they could not satisfy the new rules requiring actual coverage.