[Bug] "This helps protect our community." · Issue #4734 · iv-org/invidious
github.com
EDIT by @unixfox: The Invidious team is aware of this issue. It appears that it affects all the software using YouTube. Please refrain from commenting if you have nothing new to bring up. Thank you...

Roughly ~1/3 requests yields a loading issue. In case you were wondering why Invidious instances reliability seems to have been in decline very recently.

According to open issue

Additional context
This seems to be a global update, done before 22:23 UTC. (10:23 PM.) From my brief testing, this is present throughout all instances, and regardless of IPv6 address.