I here lots of stuff about it, but i want to know something. why did they remove it from the game?
They weren't making any money. It was free.

Seriously, it was used to exploit the game and develop hacks. There were performance hacks and unlimited ammo in the MA hacks.
The "exploit" that actually killed it, in my opinion, is there was a way to get more than eight players into a room, I had seen upwards of thirty once, essentially making it your own MA.
In the end, the good will of HTC was abused and it wasn't worth their time and effort so it went away.
wrongway