> It's really just an attempt to lock you into a proprietary system that you cannot export your data out of nor easily move off of down the road.

The GH API covers a lot of what `git` doesn't. GH's strategy has never been lock-in. They provide a good service that's constantly improving. (I'm sure other services have advantages and I'm in no way going to claim that GH is the best in class, but I am continually happy with GH and with its continued improvement.)