I think you might be missing that just because they are part of fediverse doesn't mean they can't inject ads into the ActivityPub stream or apply whatever algorithms they see fit.
Their being part of fediverse means they can broadcast their ads more widely, which would help their business model.
Sure, a lot of people might block them, but every user who doesn't block them is an additional bit of audience they can charge for serving ads to.
@volkris @fleg I don’t know man, just don’t follow them if you don’t want that 😋
You can put ads in RSS feeds (many do) and we don’t pray that big websites omit RSS feeds from their sites.