There is a separate standard for TLS over UDP, namely DTLS which is unrelated to QUIC. (https://en.wikipedia.org/wiki/Datagram_Transport_Layer_Security https:/

There is a separate standard for TLS over UDP, namely DTLS which is unrelated to QUIC. (https://en.wikipedia.org/wiki/Datagram_Transport_Layer_Security https://en.wikipedia.org/wiki/Datagram_Transport_Layer_Secur...) TLS is not TCP specific. DTLS is regularly used in IoT applications such as smart metering where the overhead of a TCP stack is costly.