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Integral? No. Used in production, by companies? Yes. Outwardly visible? Absolutely, due to Techempower.

Rust will survive without actix, but losing it is a setback for Rust in the web space.

If it's LGPL can't someone just put up a new fork of it and people transition to that?

It is MIT/Apache2, and yes, in theory they can.

Sure, but someone needs to take that on.