Assuming I could force somebody to poop on command with little effort beyond sheer willpower, I would absolutely take it upon myself to dish out petty justice with that power.
I see you being rude to people working in a service job? You get poopy pants.
I see you playing music on your phone or otherwise being obnoxious on the bus or some other public space? You get poopy pants.
Are you driving like an asshole? Following too closely? Cutting people off? Honking the moment the light turns green? Words can't express the satisfaction I will feel in knowing that you're now sitting in your car with the poopiest of pants my power could possibly muster.
I would immediately try to weaponize it. Spend a weekend making putin telepathically shit his brains out without pause should probably be enough to make him die from the sheer loss of matter and nutrients.
Okay, but at all times there is a mass of constipated people surrounding you, lining up in a queue in front of your home, begging you to relieve them! And obvioysly many havent really thought about where to go about it if you help them...