How likely is this? Everyone says "highly likely", but it's unclear what that actually means. 20% chance? 80% chance? I wonder if someone has looked at the num

How likely is this? Everyone says "highly likely", but it's unclear what that actually means. 20% chance? 80% chance? I wonder if someone has looked at the number of websites using the same CDN and calculated this probability. I'd be very interested in the results.