Because they host illegal content and don’t comply with laws. You can do a simple google search.

They are called bulletproof hosting and are illegal. They get shut down pretty quick for obvious reasons. You won’t find any reputable ones for a reason, because they don’t want to be hosting illegal content like CP. They also get their IPs blacklisted and automatically marked as spam/suspicious/phishing. It’s just a bad idea. You can have private hosting and not anonymous hosting, they are not the same.