I think this is one of the big misinformation being propagated. That somehow you would not be able to get GMail or other services if Google is not allowed to collect information. The reality is that Google did just fine before they did surveillance-based ads and they can do just fine when they stop doing them as well. There are other ad systems and Google can do just fine using normal ads.

That being said, there are great alternatives to GMail that you can use, both free and paid. FastMail, Proton Mail, Tutanote and Vivaldi.net mail are just a few options you might want to try out.