Was this just rereleased?
It showed up under New Releases.

It's very strange, Rereleases generally keep the old reviews and scores once the page goes back up again, but those are all gone. The base game and Sunless Skies didn't leave the store either and it only seems related to Zubmariner, which didn't get a new update that would warrant this change. it would make no sense to only remove the DLC, not change it and then re-upload everything while ditching reviews that you can attract customers with

What might have happened is that something went wrong with the store page that warranted re-uploading it fresh, because nothing else has changed.

by SURFER360, three days ago;

changelog, page 1, post 18;

Standalone installer updated: [Windows, Linux, Mac] Version 2.2.7.3165 ⇒ V2.2.7.3165(a).
Update V2.2.7.3165(a) (4 Feb 2022)

• Fixed Zubmariner installation and updating issue

There was an update, but not the kind that warrants a new store page, like an enhanced edition would, and the only difference is that the page has been reset with all the old reviews and ratings being gone. It's had updates before and nothing like this happened back then.

Strange indeed.

Wondering how many reviews have been purged.