It's not a money issue, as I have multiple servers already which could easily provide this service, and it's even less of a configuration issue, as I am perfect

It's not a money issue, as I have multiple servers already which could easily provide this service, and it's even less of a configuration issue, as I am perfectly capable of configure this if I wanted. But these servers are in different countries, so they would be much slower than Cloudflare DNS due to network latency. And even if I had a server in the same country for my client devices, I frequently travel to other countries anyway. I don't think I am abusing these servers, as I only use them normally as a user, it's not like I am scraping the Internet or anything like that. Unlike the OP, I am not doing any benchmarking or load testing or anything similar.