Software developers scan hundreds of millions of emails of users who sign up for email-based services. Disclosures are often buried in user agreements.

Source: Tech’s ‘Dirty Secret’: The App Developers Sifting Through Your Gmail – WSJ
They also let employees of those companies personally read your email: this is “common practice”.
As already suggested on this blog, they data mine the hell of our emails, logging your purchases, financial records, travel records and more.

For companies that want data for marketing and other purposes, tapping into email is attractive because it contains shopping histories, travel itineraries, financial records and personal communications. Data-mining companies commonly use free apps and services to hook users into giving up access to their inboxes without clearly stating what data they collect and what they are doing with it, according to current and former employees of these companies.

Any Android app can request Inbox access and once given by the user, can read all of your emails. It’s that simple!
There is much handwaving about the wording in privacy policies (which are anti-privacy policies intended to protect the corporation, not you) – but there is no auditing of third parties who are rummaging through your email.

no human reads your email to target ads or related information to you without your consent.

The don’t need a human to read your email. AI software is now the equivalent of a human looking over your shoulder, reading your email, taking notes and making assumptions and interpretations about you. All of this is collected to create a detailed dossier about you – your lifestyle, your income, your interests, your politics – everything they can discern. This profile is then sold to advertisers who wish to target ads to specific individuals.
As we have shown on this blog, these dossiers are also inaccurate.
Shouldn’t every user be told when an AI artificial person or an actual person has read their email and for what purpose?