VMs introduce security issues that bare metal don't have. Those security issues are mostly academic for most people and many projects, but not for software where a supply chain compromise could severely impact all users of that software.
Imagine if Wireguard were backdoored because someone working for the ISP that runs the VMs compromised their VMs through the hypervisor. How would a project audit an ISP? How could anything be trusted? Bottom line: it can't. ISPs don't give that kind of information to customers unless you're special (government, spend crazy money).
While it's still possible to compromise a machine through physical access, it's MUCH more difficult. How do you bring it in to single user mode to introduce a privileged user without people noticing that it's down, even momentarily, or that the uptime is now zero? Compromise like this is possible, but worlds more difficult to pull off than compromise through hypervisor.
Imagine if Wireguard were backdoored because someone working for the ISP that runs the VMs compromised their VMs through the hypervisor. How would a project audit an ISP? How could anything be trusted? Bottom line: it can't. ISPs don't give that kind of information to customers unless you're special (government, spend crazy money).
While it's still possible to compromise a machine through physical access, it's MUCH more difficult. How do you bring it in to single user mode to introduce a privileged user without people noticing that it's down, even momentarily, or that the uptime is now zero? Compromise like this is possible, but worlds more difficult to pull off than compromise through hypervisor.