I once had a day (and made a Tell HN about that too) where I couldn't access 3 of the links from the HN start page (and I didn't try all of them) during a match, because of that football IP block. It might not be half the internet, but I definitely felt like living in a country with massive censorship. And to me - given that I totally do not understand how people find watching football interesting in any way - for the most incomprehensible reason.
Blocking Cloudflare is not significantly different from cutting the internet depending on which part of it you need. We recently had a thread about CI jobs failing to connect to Docker from Spain during football. I personally know when there's football because saucenao stops working.
No need to be sorry, it is a matter of how you define the percentage. If you would define it as "fraction of traffic generated by residential/home endpoints" you probably wouldn't be off that far. Maybe because Netflix does not use cloudflare, but if you say "CDNs make more than 50% of traffic to residential" you would definitely be right