Today I was idly browsing submissions of other people at one of july contests, and i found something strange: many unrated users with random letters and digits in nickname bomb testing system using llm generated solutions every minute (at least, most of them look very like if it were generated by llm). And this situation you can see at EVERY last contest (even div. 1). I can believe that some of them are real people, but not all of them, that's very strange. Is CF full of bots?

p.s. some examples of that submissions