[Brybry]

I consider plain text emails to basically be like sending postcards across the internet.

I don't want other people to read them but I'm resigned to the fact that they are.

In that context I'm not all that concerned about Google scanning my email to serve me ads that I'm blocking anyway.

[bad_user]

I think people aren’t aware how much information leaks in their emails.

For example your entire online purchasing history is in your email. That is not information that should be public ;-)