Thanks. So TLDR:

1. PMFN (Platform Most-Favored-Nations clause): Valve forces publishers to price games on other platforms at the same price or higher than Steam. This is an anticompetitive monopoly because publishers can't sell the game at lower prices on platforms with a lower cut than 30%, which would improve competitiveness. Very valid point
2. Keys that publishers can sell on other storefronts are limited. This point is moot. The fact that Steam allows you to activate a product that was purchased elsewhere and then use their infrastructure to download the game is way more than they have to do. They can completely make the rules here as this is basically a free service that you get from Valve.
3. Some murky points about Valve policing review bombing that isn't explained properly.