ShapeShift probably wants to continue 'easy operations' in the US. If Fox.exchange says screw it and just requires VPN use then no need to listen to the US

Fees are comparable to (I've even gotten better than) ShapeShift imo.
Binance says otherwise though. They probably had the same thing in mind in the past, until they had no choice but to bend the knee and just open a separate version of Binance for the US users. Something similar could probably happen, but I doubt fox.exchange would get any famous as ShapeShift, as it looks like they aren't doing any that much marketing. They're likely to stay off the radar for a while.