So here comes the in-fighting. Looks like someone listened to the call to action to fork the language [0] and just did that to their 'beloved' language.
Again, the moment the Rust Foundation chose to be a 501(c)(6) it was all going to go downhill from there as I and others have warned about this [1] years before.
There is a good reason why other language foundations like Python Software Foundation, NumFocus (Julia lang), D Language Foundation, Zig Software Foundation, R Foundation, etc, are 501(c)(3).