

Yeah try it. It is concerningly easy. Write a program that edits the users bashrc/zshrc. Have it append a line that adds something to the front of the path, and have it shim sudo. You can even have it forward the password to the real sudo.
Instead of waiting for the user to open another shell, you can also open a subshell. (E.g. your malicious program never returns/exits, it just appears to exit by opening a subshell with the modified path)
Yeah these numbers should be reported in % of profits