Here’s what consumers have asked with answers from Grist staff and previous consumers.
It is a legitimate company and online magasine that's existed since the late 90s. They specialise in journalism concerning the environment. You can check their wikipedia page here: [https://en.m.wikipedia.org/wiki/Grist_(magazine)] They also have a high factual rating on MBFC.com, though the site does cite that there's a slight left-leaning bias in its reporting: [https://mediabiasfactcheck.com/grist/] The site itself has an about page and a form one can fill out in order to contact the business. You might want to try it yourself in order to alleviate your concerns. ;)