CGN is rather small compared to LGG. Plus the place is UPS country... CDG is FedEx's second largest hub after Memphis. Dozens of flights route through it on a daily (nightly...) basis. 1900 people are employed there. The sort centre has recently been vastly expanded. And FX even manage aircraft movements there with their own ground frequency. In other words, they have been given a lot of leeway to do their own thing. The French authorities will bend over backwards to keep them there (as they did to get the hub there in the first place) for economic and employment reasons. Full stop.
Cheers