Wikipedia is also a bad example though…

ActivityPub, as a protocol, is particularly vulnerable to EEE, since a corporation can create their own implementation and still talk to existing instances - allowing them to gradually extend the protocol, without forcing a mass migration to their service from the get go.

With Wikipedia, for example, they would basically have to create a competing site, and users of Wikipedia will not see any content from that site unless they actively go to it.

Edit: BTW, I don’t see this as admitting defeat; if anything, these migrations from service to service over time show that the corporations never win in the long run.