In theory it is a transport layer protocol like TCP but QUIC seems to mostly be used for specific application layer protocols.
And I have discussions probably every month with people arguing that "it is just TCP" and you have to explain to them that no, there is no way to do SFTP through a WAF or to run a database on that cloud service and so on.
again quic is not just Http.
you can proxy an sftp connexion through quic.
By having a (tcp to quic) gateway at the source and a (quic to tcp) relay at the destination.
