I may be speaking in defense of something I don't know, but I don't see a direct problem with other apps (e.g., Threads, Twitter if they change up what they're doing) to start talking with the fediverse.
The bigger problem is when they start throwing their weight around. The W3C (and groups like Mozilla) have had many strong battles with Google trying weird stuff because they're the biggest guys in the room (e.g., FLoC).
As long as we can rally behind the loyalist FLOSS geeks, we'll always be alright.