- a newly installed instance is "open for public" by default. Imho, this is just crazy from a legal pov.
- jitsi needs around 5 subsubdomains for its various subservices.
- setting up a "secured domain" seems complicated and did not work for me (yet).
Given these, it's hard for me to give an unrestricted recommendation for it.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.