Just because you like a company (and as a consumer, I like Steam) doesn’t mean it’s not acting monopolistically.

Valve is certainly abusing its position. It charges extremely high rents for the services it offers because of its dominance as a marketplace.

It does provide a host of services and does them well, but whether they are value for the platform fee is another question. Using those services creates lock-in and friction to port to other platforms. By providing them as part of the package, Steam has extinguished companies that used to provide those services, meaning that it’s even harder to provide the same functionality elsewhere.