Just to clarify some concerns:
1. The Hubzilla instance on social.freegamedev.net will stay (but I am moving it to another server within the next 2 months, so some light DNS issue might pop up again, sorry). But since it allows cloning instances, that is always good as a backup
2. The Planets on Hubzilla will probably stay until/if I find a significantly better solution. So far no luck, but I am exploring some options to have better ActivityPub support.
3. The XMPP server will stay, but accounts will not be linked to Hubzilla anymore most likely.
But I'll likely remove the Friendica testing instance in the coming days. Friendica is generally speaking nice, but on my specific hosting situation not ideal as outlined above.