I developed my first Android app when I was around 16 years old and I remember distinctly wanting to publish it on Google Play, but couldn't because they required developers to be 18+, and this was even before they introduced strict identity verification requirements. And iOS was a lost cause as XCode famously requires an operating system that only runs on very specific hardware for which I had no money. No matter, I published an apk on a website and ended up reaching a few tens of thousands of users that way. My app ended up transforming a (niche) industry and making a real impact on the world.

If Android isn't open, we lose the last open mobile operating system, which will have immeasurable negative effects on computing as a whole. People will need permission from either Apple or Google to create any mobile program. If you don't fit into their neat little system, you don't get permission. If I hadn't been able to publish my app for another 2 years I probably would've shelved it, decided it was stupid, forgot about it, got busy with other things, and never published it.