Same thing with email. Everyone COULD run their own email server but it's pretty clear most people don't want to. We also see it with tech companies running their own servers. Again they COULD runt heir own hardware (and some do) but it's pretty clear most companies don't want to. There are decades of examples of where people could run something themselves and having very strong preferences for using a centralized and more user friendly alternative. I don't know why we'd expect it to be any different here.