It does, but I guess this is for people who like images most of the time, and just want to avoid the tracking without sacrificing ux. I'm guessing it's inspired by https://hey.com/spy-trackers/, which also has a similar feature that works on a blacklist basis (presumably).
I'm curious why they wouldn't also eager-load _other_ images.
As soon as an email is received (regardless of whether the recipient account exists or not), load the image from the remote host.
This also degrades the spying capabilities of third parties. If they track image loads to translate this to "email opened", they'll immediately get pure false positives from any email they sent to @hey.com -- even if the account doesn't exist.
