Sorry but I think this is FUD and it potentially discouraged people from taking steps to be part of the solution and not the problem.

I’ve run my own mail server for years on a $5/mo Linode VPS, and am not passionate about email servers. It was a little difficult to set up but no more difficult than a lot of weekend projects the smart people on this site undertake. It should not be scary. You can also make the switch gradually by first setting up your MX and forwarding to gmail if you want to take it slow. There’s no reason anyone with a moderate amount of Linux skills and patience can’t host their own Email.