You underestimate how uninformed people are.

People signed up for Threads because it was “the hot new thing,” not because people wanted their data to be collected. I bet most users don’t even realise how much data is being collected from them.

Of course it didn’t. Nobody wants to use an entire separate launcher for one or two games only. Maybe they were hoping that users would have many games to choose from on battle.net… eventually, so that it would be worth to use, but I don’t think that happened.