I wouldn’t think it would have to be biodegradable, just inert and non-poisonous

Yeah I never do them…my time is worth something and they aren’t paying

I think in almost all cases it is just used to reward (or more likely) punish employees through pay or continued employment. I don’t think they actually care to improve their products, processes, etc.

TLDR if you don’t give all 10s the employee gets in trouble and eventually fired, even for things not in their control

7-zip