Depends on how repressive.
Often your main method of staying safe is appearing harmless.
You can find dedicated Mastodon and lemmy hosts more receptive to VPN users.
Anonymous use is hard due to stuff like timing attacks and writing style recognition, etc, especially if you post publicly. You want to mimic another style, for example. And create plausible deniability around timings (like say scheduled posts)
Not a fan of the marketing speak on that page, as a cryptography nerd there’s a lot of questionable stuff.
SAS authentication is stone cold dead in the LLM age. P2P with friends is trivially trackable by the ISP and can easily map who knows who. ECDSA isn’t “industry leading”, that would be EdDSA or something based on Risetto, or a pq algorithm like ML-DSA