When logging into lemmy.world the banner now says "Israel - ni**a style" (full word unredacted) and it starts linking to lemon party and a bunch of other NSFW sites.
EDIT 2: MichelleG account admin was restored and she posted and update but shortly after the changes happened again. Her account is likely still compromised with someone else accessing things via it.
EDIT 3: lemmy.world back online. MichelleG has again been removed as admin. Most things appear to have been cleaned up. Blocked instances still need to be fixed however.
Worse. Admin account. The MichelleG account is an admin and it appears that it was compromised and is what is causing all the problems. It looks like they have removed it from admin so things wont get worse but they will likely take a bit to find and repair all the stupid little changes that were made.
That's the ideal situation. It's been restored and I'm yet to see anything related to 'login credentials being compromised' or an advice to change them but as you said, it's not a bad idea.
Safety first
Yeah the admins have said they're hands off and all but one person managing the world community isn't active since ruud doesn't check his notifications.