there is an app for mobile. that also offer continuous backup of photos (like gphoto)

if they have the same hash the deduplication thing will work. if they are different quality or other stuff no. thare are plans to implement something regarding more advanced deduplication but not anything implemented at the moment.

there is a bot that corrects the links, maybe we should improve that

immich!

if the instance someone is using is defederated from that instance, would your profile appear empty?

there is an entire instance dedicated to that, use the lammy explorer to find stuff. be aware that your instace could have defederated from that instance.

no idea, you should search issues on github.

Anyway comments are replicated across all instances, so nobody stops someone from running a modified instance that does not abide to the comment deletion request. Same for posts, idk about images.

you should consider everything that get published public forever.

there is comment edit history, even if you edit them the original will still be visible

and works on mobile too