Cheer up! Google won't be selling ads, nor Facebook. But McDonalds can set up their own Fediverse server and tell jokes and memes to gain followers.
Knock knock!
Who's there?
Grimace
Grimace who?
Of course you know Grimace! Here's five hundred off your next Happy Meal!
https://adage.com/article/digital-marketing-ad-tech-news/fediverse-everything-marketers-need-know-about-decentralized-social-media/2525801