Ransomware requires a few preconditions in order to do real damage.

Mostly those all boil down to:

1. Shit-to-no backup solution in place. 2. Poor segmentation from a network/identity/privilege perspective.

Datacenters usually have this kind of stuff down pretty well or they don't stay in business very long.

Additionally, traditional ransomware attacks start as client-side attacks[phishing/fake search engine results promising app updates/etc]. This kind of attack works way better against Mary Sue in accounting or Chuck in sales but the scenario of Datacenter admins checking their Gmail on admin workstations or servers is hopefully insanely rare or never.