For WefWef users there isn’t a block button, however, switch to Memmy or Mlem and block them through that and it will also block in WefWef. Just wanted to throw that out there.
I thought the same thing but the WefWef app lets me save my 3 Fediverse accounts and switch easily, idk if it would be same for any other apps though. This way if an instance decides to defederate I can still access their content separately.
!archive@lemmy.world is a community that takes noteworthy Reddit posts so you presumably wouldn’t have any issues as long you’re giving credit to the OP.
The obvious answer is to buy more pillows so this doesn’t happen again.