The last century of History has shown that the principle of "the greatest good for the greatest number" isn't really compatible with the autocracy that tankies love some much and many are so painfully close to fascists (with but a different set of slogans) that they end up loving the likes of Putin.
That said, they seem to have their own instance, whose admins seem very very keen on the whole Centralized Control aspect of things (a very tankie approach to managing speech) so they're cutting themselves off from the rest of the Fediverse which does sound absolutelly fine (I for one am happy with people having their own circle-jerk safe-space separate from the rest - if it makes them happy whilst not causing problems for the rest then it furthers the whole "the greatest good for the greatest number" thing, IMHO).
At least from the threads I've read, there's been a harsh pushback against marxist-leninists and the likes. Even more so as their home instance is defederated from all "major players".