s2n-quic-rustls is used at run time in 6 crates (of which 2 optionally). It is a direct run-time dependency in 2 crates.

Depender (with downloads and own rev deps) s2n-quic-rustls version
6.9K 1 s2n-quic-tls-default =0.51.0
9.5K 13 s2n-quic optional =0.51.0