Possibly because (except for Leaseweb), they're all European and of limited usefulness as a result. Linode, Vultr, DO and AWS all have numerous regions around the world.
They're also typically leased for at least a full month and can't be spun up/down on demand like you can with these services.
Plus they focus on large (>16GB) dedicated servers.
They're also typically leased for at least a full month and can't be spun up/down on demand like you can with these services.
Plus they focus on large (>16GB) dedicated servers.