No, they can't see which groups you've joined unless you're both in the same group. You should get a burner number though so that you can use proper furry profile pictures.
Actually I think it needs a lot of work regarding wording, because it doesn't really read as too professional. But I plan on keeping the core concept. My assumption here is that the GDPR is fine with people sending emails with details over to servers that the email provider has no control over, so the same should apply to the fediverse.
I think so. There's no problems in joining an ongoing chat, but I recommend you try with smaller groups first. Big groups can be overwhelming since it's impossible to read everything.
Regarding GDPR, one thing I've done as an instance admin is making clear in our privacy policies that lemmy allows you to send and receive social content and interactions across the internet in a way that's similar to email.
One thing that is feasible is for established instances to give votes from new instances a lower weight. So, no blacklisting, but until they have been around for a little while to be able to calculate that their activity corresponds to their size and that nothing is off, upvotes and dowvotes could be ignored or given a lower weight.
Unfortunately there was a 1 hour data loss which causes some posts and comments not to show up on our instance. I will have decouple the database from the main server so that no data is lost when we rollback due to any technical errors.
For now, most importantly, I need to avoid making upgrades at 12am. My sincerest apologies U_U
No, Lemmy currently doesn't do authorized fetch and thus there's no way for users to request access to a certain post, which would sort of require to disclose a user wanting to get access to something. So no, they are not stored as part of activitypub.
They could be logged on your instance's server and/or the server where are an image is hosted as part of typical logs for web requests. These would contain your ip address and other browser metadata such as the user Agent, but these are typical logs that happen every time you load anything on the internet on any website that exists.
That's just a bug. It gets better with newer versions of Lemmy.