Even with my trivial side-project and a grand total of two releases so far, Google ar itrarily rejected one release for being "spammy" when there was literally a 5 line diff between it and the previous release. Thankfully just finding the depreciated dashboard and uploading an icon (the "new dashboard" doesn't have this feature yet apparently) got it through after resubmitting it.
It feels like they've set themselves as gatekeepers of Chrome extensions (Windows users can only install from the "store") but they aren't actually interested in doing the job even though you pay an admin fee for the privilege of developing a free extension for their browser.