I can understand why. Most billionaires don't have a microphone recording 24-7 in millions of homes like Bezos does. So it's much harder for them to gain leverage over their potential blackmailers.
That's like saying "You advocate against drinking and driving, but you yourself have alcohol in your house and own a car so you could drink and drive and that makes you a hypocrite". That's dumb.
However there are other actors who are both unethical and have nothing to lose who most likely are taking advantage of these devices..
There's no reason a voice-activated app couldn't play music from my network-attached storage if it could parse the commands.