Don't forget they're also monitoring people who interact with you (a.k.a. the user of services).
When I walk into a friends home who has an Alexa, or a Ring system, it is now tracking me too.
The purchaser consented, but I never consented to being monitored in a residence/dwelling where I would otherwise have the reasonable expectation of privacy!
There was a good Gizmodo article about this called The House That Spied on Me [1].
[1] https://gizmodo.com/the-house-that-spied-on-me-1822429852