https://www.cloudflare.com/terms/
2.8 Limitation on Serving Non-HTML Content
[...] Use of the Service for serving video (unless purchased separately as a Paid Service) or a disproportionate percentage of pictures, audio files, or other non-HTML content, is prohibited.
So 500MB limit or not, the author is already violating CloudFlare's terms of service.
Terns of service are also legal "CYA" documents. If CloudFlare was actually serious about that restriction, there'd be a technical limitation in place that would, for example, serve a 503.
if you look at the marketing is appears to be with out limit, now "unlimited" anything when it comes to technology should always through a red flag but CloudFlare as used this position to corner the market for CDN and DDOS services.
I think it is deceptive to hide these limits of the service deep in the ToS which they know every few people actually read
https://www.cloudflare.com/cdn/
hmmm
Took me 5 seconds to find it.
You are referring to thier DDOS service, here we are talking about the CDN Service
and clicking through about 5 pages of marketing on the CDN, including the pricing page, as well as the FAQ I see no mention of file size limits, or file type limits