Yeah, I’m not really a huge fan of Mastodon. It’s at least usable for Tor users, though; there is an onion Mastodon instance, where the admin is obviously Tor-friendly. On the other hand, Telegram, Discord, etc. are tantamount to non-existing as you can’t even sign up anonymously.
Ideally, I think an artist should have their own domain & web site, where they can control every detail, rather than relying on a platform. That’d be my Plan A. Pixelfed, Mastodon, etc. are Plan B, for those who don’t want to learn HTML (or PHP or something like that).
Working with no JS surely sounds great, either way.
People who don’t have enough space to run a local node often talk about this: https://gupax.io/guide/
It may be difficult to get 5 € / mo, but maybe a few €…? There is also some kind of “ruffle” and, although unrelated to mining, recently a zero-fee fundraising website appeared in case you need it.