Well, based on the video, they're aiming this as entertainment in some ways. This means your kids are going to run around your house playing these games, sending a 3D map of your residence to Google. Or wait, you lock this feature on your children's phone. Well, you can't exactly control their friends that stop by, or even your own family or friends that visit.
It's not like Google needs to map a complete picture of everything at once. If someone pulls out their phone this week and points it around your room, the location and data is sent to Google. Fast forward a couple of years, and someone does it again, and now they have a little more data of your home. They'll have millions and millions of little cameras and sensors around every corner of the globe, slowly constructing a virtual 3D world in the coming decade.
So yes, even if you don't want to surrender personal information, everyone around you will do it for you, and companies encourage your friends to profile you. It's similar to people uploading and tagging photos of you on Facebook. You can lock yourself in a box, and Google is going to know everything about you, even if you decide not to willingly share information. Most of the world uses Gmail. A friend recently sent out an e-mail for an event. I think I was the only person out of 20 that wasn't using Gmail. How do I not give up my information to Google? I stop e-mailing my friends? How do I contact them? Pick up the phone? Didn't Snowden inform the world of our phones being monitored? Hmm, no e-mail, and no phones. I can't even browse the internet, since the majority of sites run Google Analytics, or AdSense.
Good luck not surrendering information.
Anyway though, I don't think the intentions are evil, it's simply business. Rule number one, if you deal with users, you store as much data as possible. Delete nothing. You don't know where your business will be in the future, and this data might be priceless for improving your service, or expanding into other areas.