Just to expand a little. Only 33 states have laws against faithless electors.
Georgia and Pennsylvania are among those that don't.
And of those 33, only 14 have laws that cancel and replace a faithless vote.
Wisconsin has a law, but no penalty or cancellation.
https://www.fairvote.org/faithless_elector_state_laws
It was on my mind more whe
n it looked like Biden may have had the bare 270.
If just one elector had dropped ship (say to vote for Bernie Sanders) then no candidate would have the required 270 and congress would select the winners. That would mean a President Biden with his Vice president Pence.
Since we're higher above that threshhold, we'd need a bunch of states flipping and a ridiculous amount of elector defection to change the outcome. Nothing's impossible, but pretty unlikely.