I’m not sure that’s true for larger scale installs but small scale VMware installs are probably less easily replaced by solutions that are also as well supported and have a path for expanding.
Doing a head-on VMware takeout path hasn’t been a good business strategy for companies that tried it.
For small SMBs using Proxmox is reasonably ok-ish. Running in production for 2+ years already our customers are quite happy. We also sent some patches to Proxmox for other much larger clients...
Doing a head-on VMware takeout path hasn’t been a good business strategy for companies that tried it.