[yial]

In short brushless motors are a 3 phase ac induction motor for the ones used in quads.

Brushed motors are the classic motors that you may have played with as a kid, put in a dc current and they spin.

Brushless motors are much much much more powerful and essentially only wear out due to heat, or bearings failing.

Brushed motors can be damaged by stalling, heat, etc and much more easily.

The important part that the above poster was trying to make is that a brushed motor, any size that would be used on a retail drone/quad/ etc might spin a prop with enough force to cut..... maybe even need a stitch or two but unlikely that bad.

Whereas the brushless motors used in even small quads would most certainly need stitches, and maybe even sever a finger.

[sitkack]

Dont search for images of wounds caused by multirotors.

[Cyphase]

I wonder if your comment increased or decreased the number of people who searched for such images. :)