Thanks to EU regulations, all the superchargers in europe have both the tesla and CCS combo connectors at each stall. Telsa can allow CCS cars to charge with nothing but software. They actually had a bug earlier this year that allowed non-tesla cars to charge for free for a weekend.
In north america superchargers only have the telsa connector, which would mean either Tesla will need to offer an adaptor (which would likely have charge rate limits like their Chademo -> tesla adaptor) or add CCS to all their cabinets like they have done in europe (which will take a long time).
I suspect this is an offshoot of Norway standing firm on not offering tesla any grants or tax breaks to expand their charging network unless the chargers are publicly available. It wouldn't surprise me this starts in norway and only expands as regulations force them to open up.