In those cases I am asking myself if I should use big providers services (even DNS services, CDN, etc.) or using normal providers like LET ones.

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aws deadpool. It's always DNS

Custom Reverse DNS

For DNS, I switched awhile back to running unbound on my servers in front of blocky to apply the blocklists.

* Pi-hole nodes on my WG servers to have my custom DNS available everytime I connect to one.

https://bgp.tools/prefix/163.123.192.0/24#dns

Usages: Private VPN (Wireguard) + private DNS (Adguard) + aaPanel Stack for webserver panel backup + Monitoring Kuma.

- rDNS & DNS.

* when free dynamic DNS services started asking for actual money (the audacity!)

This isn't for VM locations. Not asking for dedicated servers -> asking for VMs. And to be specific, it's for DNS anycasting and web application firewall anycasting (without caching) and a nat6

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* Technitium DNS server (DNS over TLS)

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Have you enabled any additional options like prevent dns leaks or block ipv6?

* Adguard home: to block ads and make all the outgoing DNS queries encrypted

Adguard-home. The WG uses it for default dns.

* DoH/DoT/DoQ server(s) (dns-over-https + dnsdist + unbound + nginx)

* DNS-over-QUIC servers (dnsdist) + Adguard Home for DNS-based adblocking

In particular, ensure you enter the correct Public IPV4 address, the correct gateway for that IP and the fully qualified domain name. This FQDN will be a subdomain of one of your Cloudflare-hosted dom