Yes, you're paranoid. A drone doesn't need to map out a museum before lobbing a missile at it. An autonomous vacuum cleaner, on the other hand, would probably love to know for sure that it has covered the entire surface.
Personally, I'm imagining a little ball that I rent from the hardware store that rolls around my house for an hour and spits out the blueprints of my house so that I can feed it into a VR program for choosing furniture.
I've tested it briefly, and it seems fairly accurate as long as you follow the instructions.
Coincidentally, for the latest Roomba (the 980), we did have a camera on the robot which did visual SLAM for precisely that purpose...the idea being it would map your house while it went, and if it needed to stop for a recharge, it can go back to its dock for a recharge, and then resume cleaning right where it left off.
https://www.technologyreview.com/s/541326/the-roomba-now-see...
We also worked on a remote presence (teleconferencing) robot, which used SLAM to map the building it was in, so that a user could just click on a location on a map or schedule the robot to be in a conference room for a certain time, and the robot could autonomously drive there without someone remotely controlling it. It's a very cool technology that has a lot of really useful, non-scary, applications!
I'm having a really hard time understanding exactly what you find concerning about this. If you're relying on the assumption that it's inconvenient for somebody with physical access to a building to draw up an accurate floor plan... well, sorry, but that just sounds like a bad assumption to me.
*I appreciate the downvotes! God forbid someone be honest with their feelings. This isn't an indictment of the previous poster but rather an expression of the grinding head fuck that is building a company - which I would expect others to appreciate.
They also know your exact location, mapped with Google maps, understand your connections, recognize how you write via your email and docs. Sure they don't know the inside of the building you are in or even inside you (although they will soon I'm sure).
Now for the most horrifying... They have access to every Android phone, and they can listen to every single one if they wanted to. If you use Google voice, they can even "learn" your voice. Eventually, they can probably pick you out among the millions or billions of voices.
Combine that with your Google searches, a convolutional neural net over all your selfies... Now sprinkle in some Android wear data and they literally have all of you.
All of you.