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I think one way or another you will have to trust some entity with your DNS. Unless you are willing to use tor all the way on OS level. Even running your own recursive DNS resolver will leak your IP to root servers. Put VPN in front of it and know you trust this VPN company (kudos Mullvad).

And abusing https is for a good reasons. Blocking ports 53 and 853 is easy and many ISPs will do that.

The author also make it feel like the only option is to use cloudflare DoH on Firefox while that's the first option, there is also nextdns and custom field. There are many providers I would trust more like quad9 and Mullvad DoH.

I think the reasons why not to use DoH is the same for why not using public dns from providers you don't trust anyway.

Most of the people are happily using 8.8.8.8 and handing all their dns information to the biggest advertisement company in the world. Or wosre, using their ISP provided DNS.