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DNS outage will ways break the internet, that or BGP.
BGP has broken entire regions of AWS, GCP, and I believe Azure as well. I critical protocol that have disastrous effects if not absolutely perfect.
Or the root zone can't get into their safe for the root certificate again (or can't meet up due to pandemic again)
Root zone for DNS is pretty reliable have you seen how many of those there are around the world? https://root-servers.org/
Root certs are generally offline for security reasons and everything is generated via the intermediate certs.
Explain like i’m a teenager, what’s BGP?
Highway map of the internet. BGP doesn't care about the individual local roads just the highways or national roads between cities.
Say you want to get from your place (221B Baker St London) to the Eiffel Tower. BGP doesn't care that you need to take a left at the end of your street then a right after 200m to get onto the highway. BGP cares that in London you get onto the A13 to Dover one in Dover get on the Eurostar to Callie, once at Callie take the E44 to Paris.