There are thousands of people cheating in contests nowadays. Difference is now a considerable amount have reached Master level performance, just see the submissions for yesterday E1!

I would like the coordinators to consider the possibility of purposefully leaking codes in these telegram groups, which are implemented in a certain long and tedious way no genuine person would. Even better if such codes passes only pretests and FSTs without making it too obvious.

Cheaters on such groups will anyways cheat. They see a code published, even if its not from their "trusted source", most would copy (especially if its a higher-up problem not leaked till now). After 1-2 such cases of clear cheating, simply ban the account.

"But they will just create more accounts" — True, yes, but at the very least, it would help the standings of the current contests.

I have been a CF contest author too, though did not implement this then, it was sad to see such telegram groups selling solutions of the problems we worked so hard for.