What are the security implications of relying solely on Cloudflare for DNS resolution with AdGuard Home?

While Cloudflare is a reputable provider, relying on a single DNS resolver creates a single point of failure. If Cloudflare experiences an outage, your DNS resolution will be affected. Using multiple upstream servers mitigates this risk. Also, while DoT encrypts the communication, Cloudflare still has access to your DNS queries, so consider their privacy policy.