DC's non-compete ban should go into effect later this year https://www.jdsupra.com/legalnews/d-c-mayor-signs-bill-to-ba... and they have a subway network. Will be really interesting to see what affect this has (though of course it'll be difficult to tease out).
One problem is the dc metro tech industry is, on the balance, in Virginia, some in DC proper and a small amount of non-Federal in Maryland (less probably due to the taxation in MD).
It's possible most non-competes will be banned nationally (US), see https://news.bloomberglaw.com/us-law-week/biden-can-free-mil... and https://joebiden.com/empowerworkers/#:~:text=Eliminate%20non...