I don't think so. There are tons of ActivityPub implementations out there already that don't even support all parts of the official spec (Lemmy can't display attached images, for example). There are also implementations that have tacked on additional functionality beyond the official spec (again, Lemmy's downvotes).
It's a very flexible protocol that allows developers to pick and choose what features they want to implement in their services.
Their 2023 report isn't out yet, but "corporate patron" tier members contribute at least €240K/year, which is a not-insignificant amount of Blender's total €2,170,250 in income for 2022 (page 96). According to the same report, they also contribute development work to the Cycles renderer (page 95).