Stop rewarding them with your money for some shiny baubles which are doing nothing but spying on you and monitizing everything you do.
I do, actually, wonder if anyone has run this through Excel. Consider the following scenario:
Acme TVs makes a "Smart TV", intending to monetize the information gained from viewing habits and similar. Suppose said TV retails for 400USD. Does that sticker price reflect a subsidy from the marketing data they're expecting to get? If so, then the best thing we can do is to buy these TVs, then never connect them to the internet. This way, they've spent $425 to sell me a TV for $400. Either TV prices will go up, or they'll sell 10,000 TVs with only 5,000 reporting data back...if that proportion goes low enough, is it possible that, paradoxically, voting with our wallets could mean buying things we don't want so that it stops being profitable?