Russia's MO - and the only thing they're good at - is information warfare. They don't care about the furry porn as long as it lets them propagandize the far-right in other countries.
That's not Russia's MO. Their goal is to continue funneling money to far-right westerners and having a funding platform lets them do that. Furries using it provides plausible deniability in the same way that anti-censorship activists using Tor provides deniability for CIA agents.