If the amount of money massively outweighs your bills, then I would say yes. Also if your "bills" are extreme luxury, then even without that. We really need to stop with this massive wealth inequality. Our economy works on transactions. If the profit margin on any transaction (including labor) is exorbitantly high, then something is going wrong. An investment banker is not more valuable than a teacher. A CEO is not more valuable than a janitor.

Exactly. The question is how much is really necessary to operate that service. We as a species really need to stop thinking about constant growth and more and more wealth, and that includes growth and wealth that is "reasonable" compared to other extremely greedy people. Right now it looks like Steam is growing to infinity and making more and more money. They're the same like everyone else trying to make more and more money. Of course they're more ethical and they return value for that money, but they're still part of the same system of infinite growth that is not sustainable.

This infinite growth is happening because they extract more value than they require. If they extracted as much value as they require to sustain their business, they wouldn't grow. But of course constant growth is what everyone expects and thus no one sees a problem with it.

I see it as stealing.

Who said anything about costs/bills? I'm talking about excessive wealth extraction. If a group of people gets massively wealthy by taking lots of money from other people, one should wonder if they really need all that money.

It's still stealing if the profit is this extremely high. Of course a successful business includes providing a useful product. But if you make so much more money per employee than any other company, that means the amount you're charging is disproportional. They could change Steam fees to 5% and still be extremely profitable. They choose not to because of greed.

This is not me condemning them by the way, I think their greed and what they do with the money available to them is still mostly better than what other people do, but it's still greed.

I define all excessive profit as stealing. In an ideal world everyone would be earning roughly the same. (Or no earning being necessary at all, but I don't want to go into every detail)