I have at least 100 essays that are owned by someone other than me. I had my big boy pants on when I made those deals and knew precisely what they meant. Knowing doesn't stop me a bit from being irritated that some of my best is unavailable to me.
There's an answer in there. What I post on Hive is mine. For better or worse. I also have a large collection of pieces sold as 'single use' so that I still own them, and they are waiting patiently for the right people to come to Hive. If I live long enough they will have value for more than just their words and photos. Another answer.
Finally, for me: I can write exactly what I choose. Again, for better or worse.
Thanks for another thoughtful and needed piece.