Just installed the game again and select my current resolution and played two maps or three? and had fun.
Does anybody know why they removed the game from the shop?
Who would do such a thing?
I just played SinglePlayer and had fun. This alone should be enough to be sold.
Money, money, money...? Don't they want money?

like any other game on steam, they delist it when keys run out

It was removed over a decade ago for unknown reasons, likely licensing due to Activision.