That’s not advertising, that’s prosthelytizing. Advertising has to be for goods and services. And just telling someone about something isn’t advertising. It’s when you spend money or resources to bring attention to that thing that it counts as advertising. People keep saying that putting a sign on your building stating the company name is advertising. It’s not.
Yes, this isn’t advertising. It’s proselytizing. Advertising has to be for goods and services and it has to be explicit. Me telling you about the company I work for isn’t advertising.
With that, you could sue Google and other companies pushing anti-adblocker tech for discrimination, just bring up all the cases when the supreme court sided with cristofascists to oppress other people.