funnily enough i actually got flagged for posting a regular comment on a game, and i really don't know why my account was flagged when spam comments are getting through fine.
i already had 2fa activated on my account... i have contacted itch support via email about this issue, but as of this comment, i have not received any response & don't seem to have a way to check if this warning on my account has been removed or not.
so clearly itch is trying to do something, but what it's doing is flagging real human accounts & not spam bots.
anyway, not a great solution but what i've been doing is adding custom css to hide the comment box entirely.
pros: it leaves up the old comments at least.
cons: real people can't leave new comments and that's sad...
the code:
/* hiding comment box */
.community_post_form_widget {display:none;}
.community_post_list_widget::before {content:'[Comments closed due to site-wide spam]\00000a \00000a \00000a'; white-space: pre-wrap;}