The devices we use on a daily basis are so convenient and technologically advanced it's almost as if we're truly willimg to give up everything we know about ourselves
For the most part, you can (still) control this. Stay away from the "Internet of Things" and you're pretty much okay.
- Fitness bands: health rate, daily steps count and body activity, your sleep and more..
I've used those before, but only to measure my heart rate. Don't buy one that connects to the internet.
- Robot lawn mower: your garden's size, shape, structure
That shouldn't be a problem. As long as it doesn't have an internet connection, anyone who gets access to your lawn mower can literally see your garden too.
- Robot vacuum: scans your house with a camera; creates a 2D/3D model of your home floor; knows any new change in your home decoration
Again: as long as has no way to share this information, it shouldn't be a problem.
- Baby monitor: audio and video data of your own baby growing up and speaking
I prefer cables over wireless, but that's a lot more work than wireless. So the next best thing is an old-fashioned baby monitor without video. Or just leave the door a bit open.
- Wireless surveillance cams: now that wireless, cloud-enabled cameras are more convenient, a lot of people put their own home security at risk by leaving audio and video information from your house's interior/exterior on the web
That's a privacy problem indeed, but mainly because of something other people (and governments) do. There's also not much you can do against it, although
face masks, sunglasses and a hat can help.
- VR headsets: Windows Mixed Reality headsets 3D-scan your room in order to let you play without having to install external sensors for the headset/controllers
Another thing I don't use.
- Alexa: she knows your To-Do list, what kind of music you like, the way you talk, listens continuously to your conversations with your family and friends.. and more
This becomes a big problem. I don't have Alexa, but any phone, mediaplayer or even TV nowadays is a listening device.
- Zoom: your in-class behavior, way of thinking and facial expressions in different situations are recorded and exposed for potential bad actors to make use of them.
Nothing a piece of tape can't fix. Or use an external monitor, a laptop can't see me if it's closed.
And then comes the worst one: your phone:
- With or without SIM cards or any kind of modification, your phone can be tracked at any time. Google knows where you are constantly, probably knows where you live, where your school/work is, which houses and stores you frequently visit, the stuff you're interested in, who you've added to your contacts, which kind of videos you like and more.
- WhatsApp knows the patterns you're using when talking, who you mostly chat with, for how long and about what. Instagram and Facebook enters your private life even further, most people filling in private details about themselves
- Facial recognition or fingerprint unlock: your physical fingerprint copy and facial structure sits inside your phone.
- Android Auto and CarPlay: well done! Google now knows what kind of car you own as well.
You can adjust your privacy settings, turn off location services, and even better: turn off your data connection. Don't use finger print or facial recognition.
Check
Google Takeout to see how much Google knows about you, it's quite scary.
One solution is feeding Google incorrect information: don't tell them where you work, you don't need Google Maps to find the location anyway. Tell them you work at another address you frequently visit. Don't use an account with your real name on your phone, create a fake email address for it.
Your name isn't Kevin, is it?
You check into a hotel and your location is marked, sometimes on social media especially Facebook. I am always conscious of switching my location off on my phone because of this. You don't want to get whacked for something you don't know. A lot of crypto holders have been traced to their homes through this. Another is social media sites using data analysis to push adverts to you online with what you might need because of sites you frequent. Facebook does this a lot.
That's easy to solve: stop using Facebook. It's even better if you block all their tracking domain names.