Interesting, because in your previous comment you said literally the exact opposite, that people just needed to open it via the launcher to get the next update.

My previous comment already says this. With metro exodus, they expected people to rebuy the game on epic, and only reversed the decision after the immediate backlash.

Which, mind you, is not a game they developed nor published. Your valve example is the owner of the game moving their own game into their own brand new launcher, with conflicting claims of repurchase. Epics example is buying out a random hyped games release and scrambling to backtrack after it blew up in their face