One could argue that for most non-engineers, non-DIY is crucial for most products.

For example, in the 90s a lot of people thought everyone would host their own email servers. In reality, consumers flocked to Y! mail and later Gmail, since most people really can't or won't do this themselves.

Most people also do not change the oil on their own car (at least in the USA) etc.

In my mind the question is can you develop a great product in this area. It is possible (and sad) that Ring or Nest is as good as it gets (or have default won due to superior distribution). But I do think there are a lot of features I would want as a consumer that would make this experience better for me.

What's wrong with subscriptions? If you are getting an ongoing service (like Spotify, or HBO, or magazine delivery, etc...) it seems that an ongoing fee makes sense.

Products turning into services, that's what wrong. You stop paying, the devices stop working. Or, they decide they're bored with providing the service, and pivot or get acquihired (or just decide to prod you into upgrading), the devices stop working.

Plus, it seems that the new breed of service companies isn't satisfied with just providing a service in exchange of money. They also use the opportunity to exfiltrate as much data about you as they can get.

That is fine. I am happily paying for Spotify as they provide me with tremendous value day over day. I spend much less on music than in the days of buying CDs and Have access to a huge catalogue, instantly.

You don't subscribe to cable tv or netflix?

I do, but a) problems of these businesses are well-known, and b) there's a difference between a subscription to entertainment and subscription to necessities (or at least things with higher impact on one's life).

Also, in case of cable/Netflix, a lot of downsides are mitigated by piracy. There's no worry you'll be cut off from the entertainment you want, because you can always Torrent it if push comes to shove.