Imagine throwing away your vote when the country is teetering over the abyss of fascism. This is possibly the most important election of our lifetimes, and people are still playing dumb games.
It might not be worthless. Total Popular vote may play a factor in how the Supreme Court decides if it ever gets to that, in that they would be more reluctant to steal the election if it were say 60/40 compared to 52/48.
I live in South Dakota, a state that is about as red as you can get, and I (and my wife) both voted for Biden (did early voting and dropped our ballots off in the drop box).
My vote is in a state that Biden has no shot an winning, yet I still voted for him.