These ring devices are also installed outside of the US. The law is entirely different in other countries. A statement as "no reasonable expectation of privacy": why not? Just because people could record and film you doesn't mean it's allowed or that it's ok.
For Netherlands: You cannot just have a camera recording the public. Though there's a bit of leeway, meaning if you have a camera recording your property it's logical that it'll record a bit of the road. You just have to minimize that bit. Interestingly enough, police actually encourages the installation of Ring camera's (so specifically Ring over anything else). It seems you can install these if it's just in front of your door and property. However, if they're on a flat (where neighbours need to walk by your door to get to your door), then you cannot have these.