Google is spending many millions of dollars per year developing and maintaining free software like Chrome and Android.
If the government will miraculously enforce the current anti-competition laws and break the company like they did with Bell Systems in 1982, these Google’s products will suddenly become unsustainable.
And it is "free" because it does not impact their business models, on the contrary
From AOSP docs:
> Android is intentionally and explicitly an open source effort (as opposed to free software)
One of the reasons Android was a success while Windows Phone failed, Microsoft charged something like $30 per device for the OS license.
Google has to play store on Android which earns them billions of dollars.