Their definition of evil was insubordination, their way of telling people to listen to them, while also trying to legitimize their message.

Another idea is that somebody found an exploit in the software and figured out how to use it for much more then interfacing with vending machines. So in essence the Borg is one giant botnet accept instead of ddosing or doing database leaching they assimilate people and make them part of the botnet.

Not your brain but rather a tiny little chip inside your brain, still would be a rather difficult task (that’s an understatement) to unbrick or replace it though. Unless they put a debug Port accessible from the outside you would need surgery if you needed to JTAG to unbrick it (probably would need it anyway since if they go this route they probably won’t let you access the pins you need to from the outside).