[I_Am_Nous]

A recent possibility could be Valve releasing Counter Strike 2 by replacing Counter Strike: Global Offensive entirely. Technically you can still play CS:GO by selecting the version in the Betas drop down (for now at least) but there are plenty of people who purchased CS:GO years ago before it was free and are upset because their "paid" game was replaced by a "free" game.

[reactordev]

Paid game replaced by a free game replaced by a different game entirely. That’s an anti-trust lawsuit waiting to happen. At the very least consumer protection law.

[I_Am_Nous]

I believe Overwatch was originally a paid game, went free-to-play, and then was "upgraded" to Overwatch 2 in a similar way to CS:GO>CS2 did, but I don't remember there being as much anger over it.