1) From the metrics I recalled when I interviewed there, and assuming the given probability is correct, that means a potential of 100k-200k paged with private data leaked every day.
2) What's the probably that a page is served to a cache engine? Not a clue. Let's assume 1/1000.
3) That puts a bound around a hundred leaked pages saved per day into caches.
4) Do the cache only provide the latest version of a page? I think most do but not all. Let's ignore that aspect.
5) What's the probably that a page contains private user information like auth tokens? Maybe 1/10?
6) So, that's 10 pages saved per day into the internet search caches.
7) That's on par with their announcement: "With the help of Google, Yahoo, Bing and others, we found 770 unique URIs that had been cached and which contained leaked memory. Those 770 unique URIs covered 161 unique domains." Well, not that we know for how long this was running.
8) Now, I don't want to downplay the issue, but leaking an dozen tokens per day is not that much of a disaster. Sure it's bad, but it's not remotely close to the leak of the millennia and it's certainly not internet scale leak.
9) For the record, CloudFlare serves over one BILLION human beings. Given the tone and the drama I expected way more data from this leak. This is a huge disappointment.
Happy Ending: You were probably not affected.