I remember when Metro Exodus was about to release, Epic bought them out and they made the game unpurchasable on Steam after people already preordered. So only those who preordered were able to play on Steam for the first year after release. Valve left this statement on the store page.
Ubisoft pulled something like that with Anno 1800. If you pre-ordered it on Steam it was possible to install and play it, as it was only delisted but not removed entirely. Buying the DLC was a bit of a pain as you couldn’t search Steam for it, you had to dig up the direct Steam Store link from one of the official posts on the Ubi forum. It wasn’t ideal, but at least they had the sense to make everything available immediately on Steam for those that already bought the game there.
