Not to this level.

If the whole Internet goes down, it's not clear if it could even be cold-started, at least faster than it takes for the world economy to collapse.

It hasn't happened in a while, I think this is the last major incident https://en.wikipedia.org/wiki/AS_7007_incident

There have been numerous high profile incidents. I can't find a list, but BGP troubles took Facebook down for a while in 2021: https://engineering.fb.com/2021/10/05/networking-traffic/out...

I remember experiencing that outage, but the entire internet wasn't down. Sometimes some Chinese providers also do weird BGP stuff. BGP failures tend to be isolated to certain networks and not the entirity of the internet.