I don't support denying healthcare based on choices. But I heard that some hospitals in Texas have started using it during triage. And there is certainly precedent for that. E.g. try getting a transplant if you are still engaging in the behavior that caused you to need one in the first place. So if a hospital has only one bed available and two people to take it, one of whom is vaccinated experiencing a severe breakthrough case, and another is someone who chose not to get vaccinated, the hospital has to make a choice on who is most likely to survive.