You can add trusted CAs to your system though...
Re:Why HTTP/3 is eating the world
by treesknees on Thursday October 05, 2023 @11:13PM
(#37786788)
That is true. But an actual self-signed certificate is not signed by any CA, so it still can't be used with QUIC connections (with specific clients such as Chrome, anyway.)
There does appear to be cli flags to change the behavior, but I don't see how you'd do that on mobile or embedded browsers.
[1]https://www.smashingmagazine.com/2021/09/http3-practical-dep...