The whole Fediverse is still a little on the niche side, but if growth continues, I think this is exactly another development. When you work for Company X, your work email is usually somebody@companyx.com, likewise I would expect official Fediverse presences.
Where it will probably take off though is when somebody starts selling corporations a turn-key solution. Kind of how products like Outlook took over corporate email.
One of the first ones I thought of as well. Lots of indie games that are lots of fun that I’ve gotten for less than $10. I’ll add Stardew Valley and Slay the Spire, but they might be more than $10.