Something akin to the opposite of review-bombing is going on over at the Metro Exodus Steam store page.
The Metro Exodus Steam store page doesn't sell the game - it was removed after Epic and Koch Media / Deep Silver signed a timed exclusivity deal for the game to be sold on the Epic Games store for 12 months.
That decision sparked a backlash from some Steam users who were upset Metro Exodus had left Valve's platform. And some took to review-bombing previous Metro games on Steam in a bid to show their discontent.