Why is this idea so out there? Most streaming used to happen over UDP. It might still. Anytime you have a use-case where latency trumps reliability (and security), you should use UDP.

That brings me to another point: HTTPS isn’t preferred because it’s the defacto standard now, it’s the secure bit, the “S” in HTTPS, which makes it a better option than using plain HTTP over TCP.

By going completely bespoke means you’ll need to implement your own protocol that implements some level of security and redundancy in UDP communication.