Not quite the same issue but we have had concerns about Google's business model and how it conflicts with ours. Google is a data collector and seller - that's where they primarily make money. You didn't mention why the bot flagged your account, maybe you don't even know, but I suspect in some way it was due to impacting the flow of data to Google. They protect this with a passion.
We're been moving away from Google dependencies for 6 months now - no regrets.
This makes some good points - metadata and trackers are the main privacy leaks with email today.
However, email encryption today is about not trusting your ESP (Email Service Provider) to not scan your email. It's about encrypting from your ESP to your client in a way that the ESP cannot see what is in the email.
Is ESP protection a mainstream concern? Yes. Is lack of encryption the biggest privacy issue with email? No. Does encrypting emails address a real concern? Yes for some.