I think this is very hard at this point. Manny Fediverse communities are quite small and fear that their community will be flooded with content from any external platform. We even saw this when a lot of Reddit users came over to Lemmy. So in those cases there will be a lot of distrust.
Smaller companies could easily use a more strictly controlled* Lemmy instance to provide a space for their community. That would allow people to interact with that community without having to setup a new account. *Tightly moderated and limited to admin created communities.
But anything large will just be distrusted as long as the platform is much larger than large Fediverse instances. Maybe EU law could help to protect the Fediverse from EEE. But EU law also moves slow, and we don’t want laws slowing down the growth of the Fediverse either.