There are also three major consoles, PC, Steam, and a ton of other ways to distribute games. It's a highly competitive landscape. If you want a phone, you've got only two options.
DOJ, burn the Apple and Google monopolies to the ground.
This is a contrived point of view, and I'm sure the product managers at Nintendo, Sony, Microsoft, Apple, and Google would all strongly disagree.
Remember when the PS3 used to be used for super computing? Sony quietly ended that program when they realized that wasn't the business they wanted to be in.
That's not true at all. There's 2 primary OS choices, but on the Android side there's dozens of manufacturers, all with their take on things. Android is not a single option, it's hundreds. You even have choice of app stores. There's even options that have zero Google at all - like the Huawei P40 Pro. Or for an older take, silent cirlce's Blackphone or Amazon's Fire Phone. And even if you are in the very small minority that actually buys a Google phone, they even provide instructions on how to unlock the bootloader & flash a different OS: https://source.android.com/setup/build/running#unlocking-rec...
The certification process for consoles is also a lot tougher and more expensive.