> A reassuring line that said Sonos ‘does not and will not sell personal information’ has disappeared [from their privacy policy]

The crux of the issue. How value is customer data really? I know very little about this.

How valuable? I'll give you a hint: It's so valuable that, for some companies, it's the ONLY thing they sell... and they are worth billions of dollars. You may have heard of one or two of them. :-/