I'm not a believer in the theory that Canonical is trying to migrate everything to MIT so they can have their proprietary Linux. Some people think that their move to Rust projects is a cover for that goal.
But in this case, Canonical Sequoia PGP is still GPL, so the conspiracy doesn't make sense here. Hence my joke.
All evidence just points to Jon Seager, VP of Engineering at Canonical, just really liking Rust.