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It looks like by default s2n-quic uses this TLS implementation, which is not based on the ring crate (though it is written in C)
https://github.com/aws/s2n-tls
CUBIC is a good baseline congestion controller. It's the default one that is being used in Linux, so it should provide adequate performance for a wide range of use-cases. Plus it's not so "olde" - the specification is actively improved (see https://github.com/NTAP/rfc8312bis), and the implementation of the algorithm inside s2n-quic even lead to the discovery of spec gaps that had been fixed as part of this effort.
Like most other QUIC libraries the congestion controller is also pluggable. So if a different one makes more sense for a particular use-case, it could be integrated in the future.