I'm not sure why Sonos haven't...
Enabled firmware updates with a new *feature* that can be enabled/disabled, depending on whether or not you agree to the dta slurp.
Oh wait, that would mean very few people would agree to it, whereas with this method, people are coerced into agreeing!
I wonder how many T&C changes there have been where this kind of thing hasn't been noticed... how many jokingly added the Human Centipede clause? Does one unworkable clause render the whole agreement null and void?