samer wroteThe post mentions that ISPs were getting the "Google cache service" and passing it on to customers.
This makes zero sense. "Google Cache" is not a service provided by Google to ISPs. The only thing I can think of is how Google caches a page when its crawler indexes it and makes it accessible when you press the "cached" hyperlink next to a search result. Not sure how this relates to slow internet speeds.
I guess some ISPs were forwarding youtube requests to a local google cache server (something like a google cdn for youtube) which saves international bandwidth.
When this stopped, all requests were forwarded to parent google server in europe/us/whatever and this caused a congestion in the internet in Lebanon.
Ideally, there should be a google cache cdn, a cloudflare cdn node, etc... in Lebanon.