Hi Michael,
I too can understand your frustration but I’m wondering if there is anything the community can say/do to encourage you and your plugin back to the WordPress directory. I’m guessing it’s a bit late because you have already made the move to Github but there are so many good reasons for getting it back I felt it was worth asking the question again.
Of course you owe the community nothing at all after all your hard work but if you were able to reconsider then I’m sure many thousands of users would appreciate it.
For those people that rely on the WordPress update mechanism for keeping other people’s plugins secure and up-to-date this is really the only future proof solution. My own process is a long way-off from being 100% git-ready and I’m guessing that’s true for the majority of website owners.
Whatever you decide, all the best and thanks for a great plugin.