I agree with the video narrator; the main reason I have a motorized bicycle is because of it's legal status. Here in Brazil I can have a 50cc motorcycle and not need a plate or license, but you get stopped at police checkpoints and asked for your documents because you look like a normal motorbike/scooter.
I've been through 2 checkpoints on my 50cc motorbike; the first time they checked my documents (the receipt and my ID) and let me go after confirming it was 50cc, but the second time they threatened me with made-up laws when they realised I was a gringo. It's not uncommon here for police to plant drugs on people that defy them, so I paid the 'fine'.
I've also been through 2 checkpoints on my motorized bicycle, but haven't been stopped. I don't ride the motorcycle much anymore, I get too stressed about being extorted again. The MAB is so obviously not a proper motorcycle that they don't stop me, don't find out I'm a foreigner and don't rob me, which is nice.