s2n-quic-rustls is used at run time in 4 crates (of which 4 optionally, 2 directly).

Depender (with downloads and own rev deps) s2n-quic-rustls version
2.3K 1 s2n-quic optional =0.16.0
170 1 s2n-quic-tls-default =0.16.0