Sounds like you may be right.
But they are member of the NTP pool and they are quite dominant too. In some 23 country-zones they are the only service present, like in [0123].il.pool.ntp.org.
(Like @stevesommars already stated; they run a pretty amazing anycast infrastructure to accomplish that. It’s fair to ask the question why any big, commercial company would do such a thing.)
What if the pool would be looking for a new maintainer, for whatever reason… (maintaining it is a lot of hard work!) would Cloudflare be willing to adopt it, just as they have with icanhazip? Is there a chance this might actually happen? Would they allow the volunteers to stay in some form or shape, or would they indeed run it completely by themselves with their own servers? And would all this be good or bad?
I don’t know. It was just a wild thought that crossed my mind.