I used to do this (before my server died). You can for example use this to bypass Proton’s free tier one user per account limit.
Basically it’s about correctly setting the wireguard’s AllowedIPs and DisallowedIPs. Your laptop wants to send everything through wireguard. Your home server wants to send everything through Proton (or Mullvad or aVPN) except the communication with your laptop.
(I did that by marking the packets from one VPN with fwmark and sending marked packets to the other but that is a dumb solution for such a simple problem.)
The title is bs. There is no “push by Canonical”. A random person on the internet wrote Uutils in Rust because it’s easy to write fast code in it. Then Canonical wants to package the software but they aren’t “pushing”, they are just packaging software someone else wrote. Canonical’s goal is memory safety but that’s not the author’s goal because Coreutils haven’t got many vulnerabilities anyways.
The licensing part is sort of sad. The author picked MIT, because he does not care. He also said that he does not want drama. Well he did get the drama. The sad part is that I think that he would be willing to change the license to GPL, had it not been for all the childish drama and “hate”. Communication is difficult for people online, unfortunately.