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Recently the online servers for Might & Magic X have been shutted down. As a single player game, online support worked for the third party DRM of Ubisoft connect.

After this it was not possible to continue after certain part of the base game and was not possible the access to the payed DLC. However it was possible to play the game modding some gamefiles, so it was reasonable to wait for an official update patch that allowed to play the game and DLC without third party DRM. Too optimistic.

It has been delisted from Steam and is absent as an individual product in Ubisoft Store (apparently it is still included in the Might and Magic bundle).
Yes, DRMs are threatening games, we know this here.
Steam doesn't sell games, it sells rights to use them, a contract which can be halted if the seller decides.