The mastodon devs decide what to merge, though. If they don’t see the value of a feature, they won’t merge it.
If you want to extend the protocol, sure, go ahead. But you’ll be alone on it, since no one outside of your protocol island can use that specific feature.
I mean, that sometimes did happen.
Germany propped up the Commerzbank after 2007 by essentially buying a large part of it, and managed to sell several tranches with a healthy profit.
Same is true for Lufthansa during COVID.