Plainenglish.com sits in an awkward spot. The domain has been registered since 1995, and the site's web hosting, encryption, and email setup all check out technically. You don't see those features on obvious scam operations. But what you also don't see is who runs the site, how to reach them, or what policies govern your data. There is no about page, no privacy policy, and no contact form. For a site with this much history, that level of secrecy is unusual and worth treating as a serious red flag.
If you are considering signing up for something on plainenglish.com or handing over personal information, the lack of transparency should give you pause. Most legitimate websites with any kind of user interaction — even a newsletter — publish a basic privacy policy. The fact that plainenglish.com avoids this entirely raises the question: what is there to hide? Until the operators show themselves, the safest move is to treat this site with suspicion and look elsewhere for whatever it claims to offer.