"Consumer rights aren’t features" > Any attempt to weasel out of a marketed feature set is generally and colloquially known as "false advertising"; consumers have a right to the features of a product they purchase under the original conditions of the purchase agreement.

"Then sue them" > My point was that the force of the state is a necessary evil to ensure fair competition. Yours implied that the force of the state is overreach, but if you warrant that, then you wouldn't enjoy protections against corporations afforded to us by antitrust law.

"That you're not using something..." > For you to claim that sideloading presents additional threat surface to the normie consumer, you need to also claim that normie users are sideloading. This means that if 99 percent of users are not sideloading, there is no threat surface.

"Because corporations tend to die when they do anti-consumer things, but governments keep doing anti-citizen things without much trouble." > Absolutely not. The paradigm has changed from the time when you could vote with your dollar. You and I are economically and legally irrelevant (where is Congress, anyway?), and corporations like the Big G are too big to fail. They are -already- colluding with government to do both anti-consumer and anti-citizen things.

Nominatively, this is why both the government AND google do not want you to side-load software outside of their control.