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.
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.