Honestly not enough furry artists have joined Mastodon for me to care to make an account. I heard there's a lot joining Bsky though so I'll check it out if I eventually get an invite.
Furry porn is an unfortunate positive signifier of a viable website. If the furries have enough of a community built up to begin posting porn then odds are the website will be a lasting one. The fact that you've had to block so much furry porn is a good omen and shows that lemmy is the real deal. As the old saying goes: the Internet is for (furry) porn