On one hand, I hate the idea of rent-seeking, gatekeeping storefronts taking 30% of every developer's revenue.
On the other hand, Valve seems to use that power to do things that benefit the consumer, sometimes. Look at all they've done to promote Linux as a gaming platform.
Or maybe that's just incidental, and they only look good compared to the actual Satan worshippers running the rest of these companies.
How are Valve gatekeeping?
They don't control PC gaming, you can self publish your game if you like and there's absolutely nothing Valve can do to stop you (unlike on say, Apple, Xbox or Playstation). Valve is the 600 KG gorilla in PC gaming because they do good work and deliver promises, for their 30% they handle a lot of things for you, payment processing, currency exchange, customer service (OK, here is where they aren't particularly stellar), content distribution, security, so on and so forth.
If anything, Valve has been a bulwark against other companies like Epic, Microsoft and EA trying to become PC gaming gatekeepers.
Also, please do not sully the good name of Satan by comparing him to the likes of EA, Ubisoft and Microsoft.