Interesting, even though I don't use Funkwhale yet. Especially the first point seems to apply more generally to fediverse servers. I think with current settings I'm ok, but I'll check some more. These are the questions for servers like mine, I think:
- Does your server proxy remote media to be included in a visible post and does it check the media is indeed remote and is actual media. It's my belief that on my servers the answers are 'no, n/a' and 'yes, yes'.
- Does your server show link previews in a visible post and does it sanitise the included information? Here it is for me 'yes, yes' I think.