CCS supports "plug & charge" technically, but right now it is between the manufacturers and the networks to arrange which cars support it. Obviously, Tesla doesn't right now have a reason to support "plug & charge" on CCS networks when they've got their own network. But on the flipside, Europe has several networks with CCS "plug & charge" working for a number of vehicles and Electrify America is just now starting to light up CCS "plug & charge" for interested manufacturers. (I believe the Ford Mach-E and F-150 Lightning both support it today, IIRC.)