There's of course legal ways to do similarly. I thought this was a good example of John Krafcik's resignation which to a certain extent meets the same aim:

Official resignation letter:

https://blog.waymo.com/2021/04/capstone-of-my-career-email-f...

"Interpreted" letter:

https://gist.github.com/ChuckM/ff5fc8c800c7fe9160483b68ec45a...