There are more than just these two cars out there doing this. I actually got done the other night by a green XR6 (I think) turbo. I was on my bike and stopped beside them at the lights. Illegal tint so I couldn't see inside. I took off as normal, which on a litre+ bike is a lot faster than a car. The car beside me accelerated hard to stay with me to about the speed limit. First thing that goes through a bike riders mind when a car does this is 'get away from me', so I accelerated away. I'm venerable on a bike and I don't like dickheads driving like tools anywhere near me. Secondly there is a side street that comes onto the street just past this intersection so I didn't want to be out of sight, slightly behind this car, which is where I would be if I slowed down instead, as this is a dangerous position to be in if a car comes out of that side street.
So of course I accelerated some more and kept a good distance between myself and the XR6. It occurred to me that it might be a cop car but the illegal tint, illegal fog lights on and strange driving made me think otherwise.
All that said; I broke the speed limit and I got done. I had all my points previously as it's a long time since I've done anything wrong so I lost 3 points and $81 for <15 over. As the cost and points are low I will not be contesting it.
Just another hazard on the road really. We already have to watch out for so many so now that we know about this one, we can avoid it too.