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).
>>mlinks+(OP)
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).