I’m sure they’re probably not okay with it but also there’s not much they can do about it other than defederate .ml - such is the nature of open source software.
I’ve setup Nextcloud but have done next to nothing with it.
My Lemmy instance gives me the most problems, but it’s also the only publicly available service I run. Mostly the issue is it seems to have a memory leak that forces me to restart it every few days.
Everything else has been completely rock solid for me, running on a mini pc (formerly a pi4 until I wanted to start doing stuff with Jellyfin and needed more power for transcoding) on OpenSUSE Leap all in docker containers. Makes it insanely easy to move stuff. I had no issues basically just copying the docker-compose files and data and bringing them up even when switching architectures.