If you use google servers under plain text you will be exposing all your queries to your ISP and to google, which will log and monetize them. DNS under plain text is so easily captured that all entities. ISP that spans the traffic to google, google itself, and ISP that spans from google to the resolver can capture, log and monetize the information. Monetizing can occur by logging who queried, what was queried, and in either as a combination or in isolation. A lot of companies consider the later to not be private information or covered by GDPR.

The effectiveness of DNSSEC depend on where you are. If you live in Netherlands or Sweden and visits mostly Swedish or Dutch sites then a larger portion will be signed.