When did you publish your extension? I'm an extension developer that makes a mildly popular extension used by a niche group (1-2k MAU) and the Chrome Web Store has tightened their policies over the years. It's possible that you're grandfathered in (and haven't hit any of the extra reporting requirements if you haven't updated your extension recently.)

Extensions these days go through a rigorous review process, and Google regularly shuts down / imposes arbitrary restrictions against extensions due to changing policies.

I understand the importance of strong moderation to protect users from malicious extensions, but I believe Google is using that as an excuse to further lock down their store, increasing barriers to entry and making it harder for developers to build software to extend the most popular browser in the world without Google's blessing.