I don't know who's to blame - whether Mailchimp has tracking up the wazoo enabled by default and people need to be knowledgeable to turn it off, or if businesses just can't help themselves when offered analytic features, but it's pretty crazy how Mailchimp hosts enough of the email's content in cross-site tracking domains that sanitizing them leaves the mailouts empty.
When an advertising push looks like this you know they're using Mailchimp: https://i.imgur.com/Yv2QCv2.png
That "view this email in your browser" link even brings up a similarly blank webpage! That link is already tracked, by clicking on it they already know I've looked at the email and care enough to want to see it properly, but the web version is still woven whole out of cross-site tracking shenanigans that it's filtered out (e.g. https://developer.mozilla.org/en-US/Firefox/Privacy/Tracking...).