Let's say I'm a mid-market business that doesn't want to roll out internally and I don't want to shell out for Broadcom (eg. Maybe I compete with their chips division).

I still want a throat to strangle, and Proxmox, while a solid product, doesn't have the headcount needed to support me.

A larger firm like Veeam can provide both Proxmox support and additional management support.

This way I don't have to use Broadcom, Citrix, etc.