Indeed, Apple Notes has a reasonably sophisticated CRDT, including support for tables: https://github.com/dunhamsteve/notesutils/blob/master/notes....

The other day I saw a bug in it, when editing a Note that another person was also editing. We were editing separate paragraphs. My cursor kept resetting to the beginning of a word after each letter I typed (and the Swype-style keyboard had the same problem). My point is, even Apple Notes doesn't get it quite right.

one would hope that is what they are using it for, since they bought one of the best foundations for a db to exist: https://news.ycombinator.com/item?id=9418255