We are animals. Cycling is not a natural behaviour, yet we, animals, learned and adapted to it. It's not a natural behaviour for children, yet, almost every parent teaches their children to do it - some learn willingly and others less so. Is this wrong? I'm forever grateful that my father persevered with me and I still remember my first faltering pedal strokes down the garden path.
Who's not to say the monkey and the dog aren't having a lot of fun chasing and being chased and that some animals are not capable of learning some behaviours from humans without any coercion or being under any duress, as it's entirely to their advantage in some way?
One could argue that monkeys and humans are so similar that cycling is as natural, or unnatural for them as it is to us.
I don't know the story behind the clip, or what happened before or after - (maybe the money stole the bike?) but my default position is not (always) to assume the worst about my fellow humans, - that, in this case, cruelty was involved.