I'm really suprised they didn't look at all the stories of people before trying to start image or video hosts on Cloudflare and getting booted, as if all the other image hosts were too stupid to use Cloudflare for $200/month instead of paying CDNs tens of thousands a month.
Watching competing projects also added some degree of assurance. Without giving out any specific names, we are aware of a number of competing projects that even now keep heavily relying on CloudFlare (although I am obviously unaware of how much they pay), so we didn't consider it an abusive behavior. In contrast, we were also aware of at least one competitor that kept pushing a considerable portion of their uploads to imgur and basically parasitizing on them for a long time until imgur's abuse team finally took notice and brought down the hammer.
This makes it sound like we are doing some monetization of low-tier customer data. We are not doing that with any data (low-tier or anything else). That would be hella creepy.
We do track abuse (DDoS attacks, etc.) whoever they hit and use that information to protect other customers. So, in that sense low-tier customers help our overall business, but it's a common lie from our competitors that we are somehow monetizing traffic. Cloudflare's business is pretty simple: work out how to operate our services as cheaply as possible, charge web site/application owners more than that amount.