Which law was broken or is going to be broken? Which terms of service were broken or are going to be broken?
Did you buy the game and downloaded it yet? You do know that you can keep it, just as the reminder told you? "to keep the game."
Nothing is taken from you, except for the abilty to download the game from Itch after a certain date.
You can absolutely be angry about the situation. I do not like this too, because it undermindes the cloud principle and damages trust in the concept. But please be angry about the correct things and do not accuse people of the wrong things. You undermine your rightful anger with fallacious arguing.