This isn't a "block" as such. You can still view meme and 196 content and 196 from piefed.social. As another user said:

"The code that OP has linked to is part of a convenience function for admins to add content to their new instances. It can query individual remote instances (e.g. lemmy.world), or it can query lemmyverse.net, and fetch communities that look to be popular and active.

It’s completely unrelated to routine federation, and doesn’t prevent anyone subscribing to communities that may have those words in their names."