It's not like most people will know they might lose everything if they sign up with google. Most rightfully expect that google, like most other companies, has customer service. By the time they realize, they're too late

We need to start seriously spreading the word that Google cannot be trusted to hold anything important to you

I'm pretty sure this isn't a Gmail-only issue. This letter could have been written to any other email provider, but it just so happens to be Gmail due to popularity.

Email is an inherently insecure service. Security professionals had been clamoring for default 2fa, E2EE, etc. due to various breaches, leaks, and security issues that have occurred over the years. Remedying the aforementioned security issues necessitates certain practices to be phased out and the people who relied upon them to be caught up to speed or left behind.