You want privacy and security but you want it over plain IMAP/SMTP, then you’ll have to manually encrypt and decrypt every message. It’s a good thing they don’t offer IMAP/SMTP support as those protocols are old and insecure by nature - SSL and TLS are bandaids, they can only do so much.
There are compromises to keeping yourself safe online, one of which is to convenience, and the other is to your wallet - yes, privacy costs. If you don’t want to make those compromises, just open up and let Google in and get comfortable watching your data get siphoned away.
The least believable part of this image is that all those little dogs sit down and shut up long enough to take this picture (I am ignoring the usual body horror like the blended body parts, as well as the fire hazard that’s meant to be an oven in the back because people do dumber shit than that all the time). In real life at least half of them would be blurry balls of accelerating fur.