Re: DoH
Nope, Chrome will only upgrade your DNS if your current DNS provider supports DoH. I.e. if you are using 8.8.8.8 currently, it will use DoH to talk to 8.8.8.8. Nothing will change if you have something custom setup. See https://www.chromium.org/developers/dns-over-https for the list of supported DoH providers - which is really small still.