Well, interestingly #microsoft is actively embracing #linux (see WSL, #azure), #edge is based on #chromium, dot.net is not using the #java standard, #microsoft messenger is dead, and #pop3, #imap and #smtp are one of the most widely used open #internet standards. Not exactly a success story for EEE.
And if people prefer #threads or #twitter over #mastodon, then no wall around the #mastodon garden will help. I just don't see how EEE plays a role here.