Cloudflare doesnt block anyone, it just provides the tools for customers to use, we the customers then decide who to block - the webpage you see when blocked states clearly that you need to contact each and every website that blocks you, not Cloudflare
I would expect Oracle Cloud to be blocked by most webmasters - we use Cloudflare tools to block the ASN as a whole across all of our websites
Many website operators block cloud providers because they are a large source of malicious scrapers and bots.
You’d need for an operator to confirm for you the reason your IP has been blocked. @paul32 generally has the right of it, but no one can confirm the specific reason for your block other than a specific website operator.