A third party vote only matters when the message sent matters to the recipients.
if biden wins, he can’t possibly lose another election, so nothing would matter to him. but i reject outright the labeling of any party as “third party” or the idea that it’s supposed to send a message different from any other vote. when you vote, you are saying who you want to have the position. i don’t want biden to have it, so i won’t be voting for him.