In a world where quic is 7% of all traffic presently (wow, I didn't know)...

BitTorrent's MicroTP (uTP) had about 15% at some point as well. This was especially scary as:

* it used the then not-fully-understood LEDBAT congestion algorithm.

* the de-facto implementation wasn't too well understood and there no competing implementations in order to understand interoperability.

* there were no formal process when it was created.

* for simplicty it dropped half-open connections. But implemented that in a slightly faulty way.

I know, because I had an experiment where I did an Erlang-implementation of the protocol.

At least QUIC seems to be getting some process now, which is good.