Also it heavily limits the ability to add video services. Hosting costs explode as soon as you create a mass-video sharing service. There unfortunately isn't an easy answer here. What is a big impetus for the fediverse? It is to escape sureveillence capitalism and to stop being the product being sold. Well most monetization models require all those parts of surveillence capitalism: the data gathering, data mining, algorithmic boosting etc. "Sell ads" would mean embedding Google, Facebook, Amazon, TikTok, or whatever ad network trackers into your user's client. Or perhaps it is paid for boosting into timelines or sidebars, a la integrated ads in Twitter/Facebook. That requires all of the data mining, algorithms, etc. which even when done "well" often pisses people off. So we are left with subscriptions, which definitely has a chicken/egg problem even if we didn't live in the era where we expect social media to be free. Figuring out how to make even part of teh fediverse a financially self sustaining and healthy entity is something I think about a lot. I'm still coming up empty so far though :(.