Yeah, I was aware of the case, but I'm confused because it does sound like Valve's policy only explicitly restricts the sale of free keys for less. Obviously, I'm all for Valve being held accountable if they're actually requiring the game be the same price on a completely different platform.

I don't think there's any difference between "justifiable" and "simply because they can". If they can, then they can. Yeah, I do support developers, but I'd be lying if I said steam doesn't add any value to my experience. If it wasn't 30% worth of value, devs wouldn't choose it. And I'm all for EGS undercutting them to attract developers, I think that's the right way to combat it.

If there is any regulation that needs to happen to combat monopolies, then I think it's the same regulation that needs to happen on all content distribution and streaming platforms, which is: there should be a standard API for accessing content in a cross-platform way so that open source front-ends can be trivially developed. If steam (or netflix, or spotify, or google, or whatever) has established too much power, it's because they've locked their users into their user experience, and it's inherently inconvenient to have to switch between different platforms and UIs. But if regulation forced a common API, and open source front-ends were developed, people wouldn't be locked into a specific user experience. You could switch between EGS or Steam or GOG or whoever, and the only thing that would change are the games that show up in your front-end of choice. IMO that's the real way to solve it.