If the game asks you when you first open it, does it matter if the question is to "opt out" or "opt in"?
If it asks you then it's neither opt-in nor opt-out. Then it depends on how it asks you. If it's a simple yes/no, it's fine. If it's typical tech bullshit where your options are a big "I want to make the world a better place and save the whales by sending my data" or a tiny button in the corner labeled "maybe later" that takes you to another screen saying "please confirm you want to opt out of data collection and kill a bunch of kittens" then not so good.
If I want to play a game and provide my feedback, the default should be that that doesn't happen unless I explicitly say it should.
Opt-out means that, by default, you're collecting metrics from my plays, until I find the means to opt-out.