Embrace. Extend. Extinguish.
And there goes ActivityPub....
M$ excels at that, see ActiveDirectory vs LDAP.
Google's more clever, they push DKIM and alike "in the name of security" ('cos "think of the children" won't stick,.it's not encryption) and then block your email 'cos it's spam.
The net result will be that those who are now using the fediverse will keep on doing so, and the newcomer "normies" will use a fediverse based on an incompatible doctored ActivityPub .
Then there's datascraping but they can do that with a simple client.