Your usual multimedia selfhosted program that you have running in your overpowered server/rack, you name it, I could probably be using it too in my humble DS218+
I’ve been using a low power embedded-cpu server for proxmox+homeassistant+openmediavault+*arr stack, but I’ve recently built a new one with my desktop’s Ryzen 3600 CPU, 'cause I wanted to use Jellyfin. It’s gone from 35 to 60 W/h, but it’s got more drives, so I think the power consumption can be good with a more powerful server.