There’s a picture of a mug on the Wikipedia page with the warning.
Furthermore, Prop 65’s name isn’t all it does. The Prop 65 labels you see in products are there because of the second part of the act. “No person in the course of doing business shall knowingly and intentionally expose” anyone to those chemicals “without first giving clear and reasonable warning.”
That’s what the warning labels are for. It has little to do with the production process and disposal process, and is there to warn the consumer of the final product being purchased and what it contains.
The biggest issue with Prop 65 is that the lost of chemicals includes things that cause cancer under specific conditions that consumers aren’t likely to encounter and chemicals only known to cause cancer in animals. Ceramic fiber is a listed chemical, which means you need a Prop 65 label on ceramic mugs, even though ceramic fiber exposure would only occur upon breaking the mug and the effects would be negligible unless you’re crushing mugs up into powder and railing the lines like Tony Montana.
Actual Legos are fairly cheap. You can get a box of 790 for $60, which is like $0.07 per Lego. The expensive sets are the licensed sets. They pay for that licensing fee somewhere. A Star Wars themed republic fighter tank is $40 with 262 pieces, which comes to about $0.15 per piece.
Definitely some greed in there but when you’re a recognized brand with the ability to license you can get away with that because you already have the contracts so nobody can compete.
What would shooting yourself accomplish? They’d just replace you within a week.