For awhile i believe... They are using Microsoft cloud services as a node validation...
*Ripple
-Azure BaaS is currently operating a Ripple validating node for the benefit of Ripple's bank users, providing a valuable stakeholder to the consensus network.
-We’re exploring how the Interledger Protocol can be used by the Azure enterprise and developer community to enable new and novel use cases within Microsoft's Blockchain as a Service offering.
https://azure.microsoft.com/en-us/blog/azure-blockchain-as-a-service-update/