PLA is widely used as a medical plastic and its normal decomposition is into lactic acid.
Even if it is just being atomized down into smaller and smaller particles it’s safer for you than any other common plastic.
The colorants added are the only risk
The choose N heroes things is also in deadlock. They require you to choose 3 and you’re given 1 based on preference and queue time. Can’t be a1-trick but you can usually get the same hero each game