Absolute nothingburger.

From F-Droid's statement (emphasis mine):

We respect Tusky’s decision to block mentioned website; it’s their right to introduce restrictions like these into their software. We also respect Fedilab’s decision not to hardcode a login block; instead they are actively working on making it easier to block certain domains in the app itself and thus giving users more power to moderate which content they’ll see. If people disagree with F-Droid’s decision not to flag Fedilab, a idea is to develop a decentralized tag system based on package IDs which allow third-party servers to share their own warnings with their community.

They're not blocking any fediverse apps that you can use to connect to any server.

Feel free to use any Lemmy or Mastodon client to connect to any hate-filled instances your hateful little heart desires. If you don't like that some apps have built-in blocklists, use different apps, or modify them. That's the beauty of open source.

Do what you want, just don't expect the rest of the world to amorally do it for you. This is perfectly in keeping with open-source philosophy.