Probably more of column B. They have to do something to be competitive against Steam. People won't change unless there's a reason to, and, well, Steam is a thing because there's profit in allowing people to be comfortable and lazy.
Steam lets people be lazy, and you're trying to convince people to put in work so that they can be lazy on your system instead. There's gotta be a good incentive for it.
People are so vehemently against it, though, that a few months back, someone threatened the Borderlands 3 lead designer just because it's being initially released on Epic. People are willing to go far to maintain their comfort levels.