a lot of people underestimate how expensive it is just to have a 10g/25g/100g network and maintain it. that alone is extremly expensive. especially when you want it over multiple locations. if you want to connect two datacenters with a low latency high troughput network you would probably go to aws since that is cheaper. and that is just the network, you also need to maintain other stuff like storage. maintaining a storage network is extremly hard. like s3/block storage, etc.