I really mean, not getting rid of search engine services as they were originally intended to be used, but ultimately rather getting rid of as they are used against smaller sites today and preferring select sites.
Idk if Maps uses the same search engine as Google, if not while I agree maps uses a search engine, to search the info stored on it or that the user searches for, mostly what's stored on maps, I think is stored on one server dedicated to maps or perhaps multiple servers being a Google. It's not like it's picking sites and services to get it from, it's data they collected for sure but it's all stored on that service as I understand it.
The Facebook bit was really to address the potential take over of the Fediverse which since it's built to litterally protect users from just that, sure it won't help everyone who is ignorant to how the Fediverse works, but if you do know how it works you can still free yourself and jump to another instance using the exact same familiar interface on whatever platform you are using on the fediverse, like Mastodon. Also newer platforms on the Fediverse will also show up with their own servers seperated from Mastodon or Lemmy so things will be refreshioned again and again when new Platforms arrive. Most of them being open source also means no one can really buy out Mastodon or Lemmy just like that it just doesn't work like that.