I can't say for sure, but I suspect it is related to some matrix of availability of backbone connection, cost of real estate and number of people served by the

I can't say for sure, but I suspect it is related to some matrix of availability of backbone connection, cost of real estate and number of people served by the region and cost of electricity. If you look at the regions, they have Ireland and Frankfurt both already serving the EU. Why would they need to add Switzerland? What would they gain?