Yes, I get it, for most usecases, most people today prefer TS, but in the end, the team weighed their options and they made a decision they are happy with.
Open source, as strange as it sounds, doesn't mean that the maintainers need to ask for the approval of everybody who read some tweets and join the pile on.
For those who disagree with their decision and are actually affected, vote with your feet, and don't rely on anything hey or dhh related. If you don't have a choice but to keep using them and you hate this change, I feel your pain.
I don't know enough about turbo to know if it's a bad decision or not, but I don't mind people going against the grain. If people like that wouldn't exist, I'd still need to work with Scrum (in the end, how dare you challenge the collective wisdom that scrum is the greatest thing since slice bread).
They may succeed or fail, but at least they fail in their own terms and enjoy their work on their product with the language they like.