If you're already encountering blocks, I don't think you can assume there won't be blocks on QUIC unfortunately. Here are just a selection of vendors advice. There's plenty of them, and they are probably used by some schools, libraries etc.

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?...

> Our recommendations:

> Palo Alto Networks recommends creating a security policy in the firewall to block the QUIC application.

https://community.spiceworks.com/topic/2146987-do-you-block-...

> Do You Block QUIC

> Thinking about it, ... > Yes, ... > Yes, ... > Yes, ... > No, ...

https://www.fastvue.co/fastvue/blog/googles-quic-protocols-s...

> How Google’s QUIC Protocol Impacts Network Security and Reporting

> ... inadvertently created a security hole for many organizations.

> ... At the time of writing, the advice from most firewall vendors is to block QUIC until support is officially added to their products.

https://help.zscaler.com/zia/managing-quic-protocol

> Managing the QUIC Protocol

> Zscaler best practice is to block QUIC

https://www3.trustwave.com/support/kb/print20269.aspx

> Blocking web traffic over QUIC

> The recommended fix is to block outbound UDP on ports 80 and 443 ...