If I were Ryujinx I would immediately not let encrypted games play with future updates.

But…a random program online not affiliated with Ryujinx would crop up online and would… mysteriously decrypt games

… Huh how coincidental

Yuzu is written in c++ and can run on android, which seems like a major advantage over ryujinx.

Fear. The settlement agreement included promising to never do anything related to violating Nintendo’s IP rights again.

If any of the developers want to grab a VPN and new username, they absolutely could. Whether they want to risk getting sued for multiple millions as an individual is another story, however.