Looks like Cloudflare isn't happy about this url:
https://www.cloudflare-terms-of-service-abuse.com/streaming....
This is on the Business tier too, not the Free one.
(i have no personal experience with popular sites personal/free-tier sites sadly)
This is breaking all the code which relies on deno.land/std and deno.land/x registries too.
In the meantime, you can rely on other module registries or cdns:
You can also use raw github links but don't do that in production.
Doesn't load for me either.