Apart from the whole organization, governance, and openness, I haven't followed in much detail the code changes since moving to comaps, but this page has some initial changes since forking and I recall they removed the sponsored, kayak affiliate links from the fork.

And CoMaps is run by the volunteers who did majority of development on OrganicMaps anyway. Only after the fork did I start seeing actual meaningful commits in OM repo from owners themselves. For atleast a year before the fork all the big changes were made by developers who forked OM.