VM data centers. One of these machines can be loaded up with ram and host tons and tons of instances without over provisioning. Some of those VMs will be mostly idle, but others will be at full workloads, depending on the tenants.
Also, there are sites like Source Hut or Travis that run thousands upon thousands of CI jobs every minute. I worked at a place where we were resizing thousands of photos and hundreds of incoming videos ever minute. One of these could easily replace 10~20 nodes in a transcoding farm for companies that do these types of workloads on physical servers.
There are tons of commercial applications that would keep these things busy during business hours, and some that would also keep them busy 24/7.
Also, there are sites like Source Hut or Travis that run thousands upon thousands of CI jobs every minute. I worked at a place where we were resizing thousands of photos and hundreds of incoming videos ever minute. One of these could easily replace 10~20 nodes in a transcoding farm for companies that do these types of workloads on physical servers.
There are tons of commercial applications that would keep these things busy during business hours, and some that would also keep them busy 24/7.