Adjusting your product means you don't start your userbase from scratch, but I do agree that I'd prefer they start a fresh product and leverage the userbase to

Adjusting your product means you don't start your userbase from scratch, but I do agree that I'd prefer they start a fresh product and leverage the userbase to promote it. But I think it's easier for them to centralise advertising operations where possible and steer the most malleable and lucrative audience rather than appease (what they thought of as) a minority of people.