Your analogy to Google is flawed. Google links to content on other sites. Lemmy sites host distinct copies of content on each instance. While the communities aren't @lemmy.world communities the content is 100% hosted on Lemmy.world by nature of federation.
- https://lemmy.ml/post/3375472
- https://lemmy.world/post/3234363
- https://lemmy.dbzer0.com/post/2148792
All this post. Hosted on three completely different instances, with different admins. "It's not actually my community" doesn't work in the Fediverse.
Problem is, it IS hosted here. That's the nature of the Fediverse. It doesn't just create links to other instances, it creates distinct copies of content on each instance. I am neither viewing this post on lemmy.world nor responding to it via lemmy.world. I am interacting with a distinct copy hosted on a completely unaffiliated instance, in a completely different country.