However, what happens with this is that it is about low cost, and security comes at a cost. If you're trying to make something as cheaply as possible, that's the first thing that tends to drop off your list.
These things are pervasive. You can get them anywhere and everywhere. Now, if you think about it, when you aggregate a bunch of very small computers, they can't do much on their own, but they have no security. You can take them over very easily, and also, because they are doing things such as monitoring your home, they'll know when you're in and when you're out. If they're on a camera, they might know what you're typing in as your password. Add that to the fact that if you pool all of them together, these little computers suddenly become a gigantic supercomputer.
I believe that in the fall of 2016 there was an outage across the east coast that affected some of the major social media companies such as Twitter and some other major websites. It was essentially a large-scale denial of service attack. What one organization had done was to look at all of these poorly secured devices, pull them all together as a gigantic hammer, and literally hit what was essentially a major address provider in the Internet. That caused one of the largest outages ever, and to this day I think it's still the largest denial of service attack we've ever seen.
With cheap devices, therefore, security is compromised, but this is everywhere. It's in everything. When roped together, it can be pretty impressive and dangerous.