They're very portable, so you can carry them around with you in case you come up with an idea of something to write on your Tesla while you're out and about. They stick to the surface quite well and don't wash off in the rain.
(Please try not to succumb to the temptation to write "F**k off Nazi Scum" or similar on somebody else's though like other people are suggesting. That might encourage people not to buy Teslas, which is a shame, because they're great American cars.)
??? The logic is pretty clear, cybertruck was first entered production in November 2023, and Elon has been doing his shit well before then. This is exactly why I talk about cybertruck owners specifically, because other Tesla models have been out much longer, so people may well have bought them before Elon started doing shit