Gregory's ServerLet's not forget Microsoft's "embrace, extend, extinguish" business model, which could be employed by Facebook here.
By adopting and using the standard, Facebook can drive its evolution. Everybody else plays catch-up and is always behind.
Facebook doesn't have to join the fediverse. If Facebook is forced join the fediverse (government regulations) or decides to join, Facebook will be the only platform always up to date.
Etc., etc.