I mean yeah... The reason why Valve is so profitable is because they have the total monopoly of the market. This is another contradiction of capitalism. Liberals are always pointing out that competition is great, but who wants to install 50 different apps, on their PC, to manage their games? It's much more convenient, to have it all in one place.
Another thing that should be pointed out, is that Valve and Steam add no real value to the products they sell. They sell games that aren't theirs to begin with. They're just the middleman, but being a useless middleman in capitalism is insanely profitable.
And yes, the lootbox fest needs to end. It's online gambling, where children are the main target. Every company that has used lootbox mechanics, with real money involved, needs to face charges for exposing children to gambling.