Yeah this. No association is implied just by using open source software. You don't have to agree with Richard Stallman to use GNU utils, nor linus torvalds to use linux, it doesn't make you suspect politically, it's just software.

If you don't wanna be associated with communists then don't use a communist instance (hexbear, lemmygrad), that's fine. even if they don't make their own instance they can pick and choose their associations. Frankly, being associated with reddit is far worse than being associated with commies.