1) Already installed way back in 2018.
2) Already chose default author in 2018.
3) Since when did that changed? Because I haven't added new channels since late 2019. I like the old way. See for yourself, still exists but nowhere in sight to "Add and Submit"?
PS) That's because I tried to figure out how to add for two bloody days. NOT COOL. There should be screenshots, animated GIF or video of how-to in the Market "Channels". Don't like the new way, still prefer the old way.