This is what they told me.
Hello, and thank you for your interest in Netlify services.
Our automated systems have flagged the login activity for your account as suspicious. Please provide us with additional information regarding the websites you intend to deploy on this account. What topics will they cover and who do you intend to read them?
Once we have that information, we will follow up via email. If you do not tell us about the content you intend to deploy here, we will not be able to unlock your account.
This request will be automatically closed after 4 hours of non-response.
Thank you for your cooperation, The Netlify Fraud & Abuse Team