Because an angle grinder/die grinder works equally well on a very expensive pick resistant lock as it does on a cheapo master lock. Even cheap master locks have

Because an angle grinder/die grinder works equally well on a very expensive pick resistant lock as it does on a cheapo master lock. Even cheap master locks have reasonably sturdy shackles. The only exception to that, I guess, is truly cheap stuff that bolt cutters work just fine. Why bother? There's no skill to angle grinding off a lock shackle, literally anyone can do it.