Privacy of Data on Personal Gadgets

I recently read news that Amazon employees listen to conversations of Alexa too but who does not? I am talking about Cortona, Google talk and Siri. Truth is we can't really trust any tech giants with our data. They make millions of dollars from our private data.

What could be the possible solution to this? Blockchain.
Steem is great example where everything is transparent and visible. Brave browser is another example where you actually give consent to see Ads and sometimes earn BAT token on your blogs. Blockchain solutions when truly adopted will definitely crash business of all these famous tech giants.