You’re thinking of .grad

.ml is just run by assholes, but it isn’t exclusively populated by tankies. The user base is pretty hard left leaning, but so is lemmy as a whole, just with a bit less of the extra hard left.

Besides, they don’t cause trouble as an instance. You defederate from that one, and the same people will use other accounts if they’re actively proselytizing their politics. And I promise you, the ones that are doing that have multiple accounts on multiple instances just for that reason.