Just because it's biodegradable doesn't make it not pollution.
Paper is also biodegradable, but if someone threw up a cloud of little bits of paper that landed all over my house or property, I'd still be ticked off. What about poisoning or other environmental effects? What if it poisons wildlife that eats it, or maybe it's fine, but makes them fill up on stuff that gives them no nutrition like when people feed bread to ducks?
All in all, this seems like a bad idea where they're not really thinking of the consequences.