The Self-Serve Subscription Agreement is here:
https://www.netlify.com/pdf/self-serve-subscription-agreement.pdf/
I’m not aware of any specific published rule regarding crpto/nft sites, but previously they were asking people producing them to reach out to their sales team to discuss getting an Enterprise plan, as per this thread:
I’ve not seen it raised much recently so I’m not sure if that’s still the case.
I doubt you’re looking to jump from a “free” plan to an Enterprise plan though.
You can try contacting the appropriate support team via the link as shown here:
Ultimately if you are hosting content that you think Netlify may find objectionable or risky, your best bet would be to seek another hosting provider.