Comment by fareesh

The difference here is you are sharing email addresses, domains, feeds, networks, etc. none of which you will ever own if the service shuts down.

Other services can shut down but this type of entrenchment isn't there when my cloud notes shuts down, or when my hosted collaborative kanban shuts down. They can give me my data and I can go elsewhere. I don't have to get the world to update contacts and bookmarks and other stuff like that.