They would easily adapt to such things. A hundred posts in a day is still only roughly a post every 10 minutes for someone that does sleep. And that is about the frequency those fake accounts posts. A hundred a day.
Itch needs to auto moderate them somehow. Why are such accounts spamming for days? Days! You see spam accounts several days old, with posts that have lots of downvotes, yet they still post. Something is wrong here.
They would circumvent this too, I guess. I have seen bot networks and told Itch about the network. Several times. Itch did not remove the fake network. Request 207509 . The network stopped using those accounts and probably cycled them out. I guess it was a test on how to implement fake comments and accounts.
The account posted here is a hacked account btw. The scammers have lots of those. I have seen them by the hundreds. Literally. https://itch.io/t/3512426/itch-is-not-a-safe-place-do-not-download-things And yeah, it is the usual scammers that now also post comments. You will see on some of those spam accounts some fake games. Or they copied the method from a different group. Does not matter. Itch gets abuse from all sorts of criminals.