Proton's owner also gives me the ick with his Trump and the Republican Party praising. I'll look into it further and see if there are any other good options.

[Edit] I learned that CIRA (Canadian domain name registrar) has DNS over HTTPS support so I'll be reverting to them. Canadian shield does sound pretty good for a non-profit service without tracking: https://www.cira.ca/en/canadian-shield/

Proton has similar issues with leadership, unfortunately, just not as bad. For DNS, I use locally hosted unbound which retrieves records directly from the root servers. It's not the same as DoH, though, so if that's a hard requirement then you'd want something like Quad9.