If only developers/managers had their own sense of using the proper tools for the job instead of just swallowing everything the Big Tech shoves down their throat...
But when you see those job ads with all these "great new technologies" it's hard not to fall into the trap.
I've used to use an app (there are many) which measures angular velocity using accelerometer and displays RPM (you place the phone on the turntable). I can't see why would anyone need something other than that.
I've got a newsflash for you... US IS NOT THE WORLD. Stocks (companies) are US based and Bitcoin isn't. So while you are not entirely wrong, you missed the most important difference between stocks and Bitcoin in your comparison.
These ip cameras have 2-3 different backdoors, which are even easy to discover. Probably more not so easy ones. If you have this in your home disable outgoing connections at router level, and you're safe.
I had problems with manjaro in regards to package updates and kernel management. As I understood, manjaro uses pacman in a weird way by wrapping it with pamac. Pamac was unable, at least for me, to update/install a single specific package without updating the whole system first. This made daily usage a living hell, because packages that are built from source can make a "htop" installation last 30 mins. On the other hand, yay is by far the best package manager I've ever used.
EDIT: Also, supposedly, Manjaro team has some management issues.