Data collection bothers me a little but the biggest concern to me about all the internet connected stuff is hackers.
With a fully connected house a hacker could control all of it from your fridge to your computer. Heard stories of people sitting at their tv's with cameras and the watchers image pops up on the tv.
How about hackers taking control of you car. It was proven it could happen and probably has. The last story of the lady who was going down the interstate. Her car sped up to 90 and wouldn't stop. After many miles the car finally just stopped. Never heard what the cause was but could have been a hacker.
It
could have been a hacker, but it's vanishingly unlikely. There are numerous reasonable explanations that are more likely.
Concern about hacking is real and certainly need to be taken seriously, and almost everyone needs to be more security-aware and vigilant, but technologists and computer scientists are steadily improving the security of digital systems to reduce the possibility of hacking. The result is that actual incidences of hacking are minuscule compared to the number of un-compromised users of online banking, other Internet-based services, and "smart" devices.
There is arguably no corresponding improvement even
possible to significantly improve the physical security of our homes, businesses, and ourselves. At least computer systems can be steadily improved, but until humans in general decide not to prey on each other, there's a steady and greater risk of physical theft and harm up close and in person
-- via crowbars, knives, guns, lockpicks, pickpocketing, vandalism, etc. -- than there is online.
In short, on average it's safer to keep money in an online bank account and access it via a debit card than it is to carry cash in your pocket.