Keyoxide: https://keyoxide.org/9f193ae8aa25647ffc3146b5416f303b43c20ac3
OpenPGP: openpgp4fpr:9f193ae8aa25647ffc3146b5416f303b43c20ac3
Some of them will detect if using virtualization. For example http://safeexambrowser.org/ by ETH Zurich
Ironically enough, it is free software https://github.com/SafeExamBrowser
just use a community-lead or non-profit foundation lead distro: NixOS (better than silverblue/kinoite in all aspects they try to sell), Arch, or Debian.
For professional usage, you generally go Ubuntu, or some RHEL derivative.