Even calling them Skills is a bit misleading, as if they are simply tweaks to a single "AI" system, hosted purely by Amazon and no-one else. When in reality, "Functions as a Service" are employed in the backend, so depending on what you say, your information is routed to someone else's server.
I'd rather call them Taps, like wiretaps. The more you add, the more (scrupulous or not) third parties you are granting access to the things that you (and your kids, your partner, your guests..) say in your own private home. And that's without even considering the privacy implications of "Amazon Spot" camera telescreens.
The Stasi would've loved this thing..