Someone has to be putting together a first class on-premises voice assistant system. Centralizing this much sensitive data on Amazon is going to make it such an irresistible target for LEA and hackers. It's pretty much a guaranteed leak.
Sounds useful, but so scary from privacy point of view.
All of your sounds can be recorded by hacker, even if you decide not to buy Alexa you still may ended up in staying in hotel with Alexa for Business.