The thing is that this can happen even without active malice.
If the product owners or engineers decide "hey, we want to add this cool feature, but it's not supported by activity pub" the path of least resistance -- bypassing the long process of changing the activity pub spec and getting everyone else on board -- can be super tempting, and come from a place of wanting to make your product better.
Those ostensibly good intentions can lead to E/E/E without actively meaning to.
offendicula