Why no Google Play promo codes?

Just wondering if anyone knows why Google don’t have an option for promo codes? I’d love to give away some free copies of my game in competitions etc but it’s a bit one sided only giving away the iOS version.

Maybe if enough developers requested it, they’d do it?

I think they’re available but you have to request they be generated directly from Google rather than having access to a generator.

Hmm, cool. I’ll look in to that.

Because Google isn’t interested in selling games, they want you to make ad-based games so they can get a bigger cut.