It's too much work for the guests remember to log out

Chrome has a guest user. Like incognito, the moment you close it deletes everything.

https://support.google.com/chrome/answer/6130773

Some OSes, MacOS for instance, also have a guest mode for the entire OS. By default it only allows Safari but you can add other apps. Also by default it deletes everything when you log out of guest mode.

https://support.apple.com/guide/mac-help/set-up-other-users-...