You might want to read the original post--a core feature you're paying for is local-first sync, which is explicitly designed to solve a lot of the problems with iCloud.

I do want to see a world where there is a generic syncing service (maybe AWS can run one, but open standards / open source) similar to Dropbox or iCloud. I can pay one lump sum for all my storage and all my apps will connect through it. But so far no such thing exists outside of the crude file-based syncing of Dropbox, and that's not suitable for building realtime apps on top of.