Dunno about Microsoft and AWS but AFAIK Google has been powering all their data centers with "renewables" for a very long time.
I'm pretty sure many of these data centers have dedicated power sources due to the high consumption, and opt for things like hydroelectric due to cost per watt.
And at least there's a serious end product delivered, unlike crypto mining which wastes trillions of hashes to make a secure transactional network.