That seemed to me like a radically high estimate of people who use ad blockers. But I see that the first page of results on MyFavoriteWebSearchEngine support that claim.
> This was a tough decision, having used Gmail since 2007/2008. However, I had to draw the line and stop giving Google my data for free.
>
> The problem with email is that everything is transmitted in plain text.
Interestingly, one of my biggest problems with Gmail is that they don't allow actual plaintext. I used to routinely collaborate with developers who were vision-impaired, and the official Gmail phone app wouldn't let me send them plaintext email. Instead, it was some sort of HTML thing. Unfortunately, we sometimes sent code snippets to each other over email, and though admittedly it looked more or less fine, Gmail changed the underlying representation enough that my collaborators' screen readers would mess up on the parsing.
This led to me leaving Gmail on my phone, which led ultimately to me leaving Gmail entirely.