People trying to harm bitcoin don’t consider cost. I think putting anything on chain is fucking stupid, but it happens and has happened since the very beginning. At the end of the day we are talking about 4mb blocks that cost at least 6k to fill up. That’s not very much data and it’s a self limiting problem since sustained data stuffing attacks get very expensive very quickly.

individuals considering cost or not it's a limit on the ammount of spam that gets into the chain every year, that why we have fees.