There's very little downside to bicycles; they're not generally used to oppress, occupy, or exploit.
At times bikes are used for purposes that nobody would have anticipated. One example that comes to mind is generating electricity for a remote village by pedaling a stationary bike connected to a generator.
And then there's this bike hack:
You know you're a bike geek if you look at this and think, "seat's too low".
On a completely different topic: