Cloudflare blocks you from websites primarily because the website owner uses Cloudflare’s security services to protect their site from malicious activity or abuse. Common reasons include:

• The website has high-security settings that aggressively filter traffic, which might mistakenly block legitimate users.
• Your IP address or IP range is flagged due to suspicious or harmful behavior, or it may be blacklisted for past activity.
• You are making too many requests in a short period, triggering rate limiting or DDoS protection.
• Using VPNs, proxies, or Tor can cause suspicion and lead to blocks.
• Your browser or device settings (like disabled JavaScript or cookies, or unusual user-agent strings) may trigger security measures.
• The website owner has applied firewall rules to block traffic from certain countries, IPs, or traffic patterns seen as risky.

Cloudflare acts as a gatekeeper, enforcing these rules configured by the site owner to secure the site and manage traffic. Sometimes blocks can be temporary, lifted automatically after a time, or require contacting the site owner to resolve. To reduce chances of being blocked, avoid using proxies/VPNs that may be blacklisted, ensure your browser is updated with cookies and JavaScript enabled, and minimize excessive page requests.