Ask HN: Good alternative to Cloudflare for wildcard subdomains protection?

Cloudflare asks to subscribe to their Enteprise plan of min $5k/month to use their service for any subdomain. Even if they give a large number of DNS records (3500), if you run a free tier and your users have their own subdomain, 3500 is nothing and they won't let you increase it unless you are on Enterprise.

The only option would be to find some alternative that doesn't charge $5k for subdomains protection.

Any options?