I recently learned that voting on lemmy is not anonymous. Anyone can get information about who has upvoted and downvoted a post or comment.
In combination with your IP, this is a massive privacy (maybe even physical security) risk. Also, people can target you for your votes.
Sadly, this is something where I would prefer Reddit over Lemmy. Big tech scrapes data from both places anyways, at least Reddit is safe.
Really only if they’re DMs. Because a publicly posted picture yeah, they’ll see your IP loading it but they will also see everyone’s, with no way to tell who is who.
And a fairly recently Lemmy was updated to not show embedded images in DMs so that wouldn’t even work. (This depends on your client, but on the most recent official web version external images are blocked)
image proxying may become (more of) a thing in future.