The privacy policy is under legal in the footer, exactly where I'd expect it to be honest. It also gives the company registration: > 1.1. We, ZeroSSL GmbH, FN 443956b (the “Company“) and below that the company address (registered in Austria).

Don't get me wrong, I agree that there is some lack of "who actually runs/controls this", especially on the about page where I expect such things to be.

At the very least it's not as transparent as I'd wish from a CA. E.g their Certificate Agreement is from Sectigo, so are they involved? No mention anywhere else from what I can see.