They should be allowed to charge 99% if they want... But they should not be allowed to have exclusive apps or exclusive App Store.

Uh, where in his comment did he use the words “professional full-time”? He was just talking about developers.

Best I could find is that they’ll wave fees on the first $15,000 in sales, which is pretty damned low. Then it’s 30% until you get in the millions of dollars, and then they’ll cut it to 25%.

I’m not sure about “vast majority”, but I’m sure that lots of devs are making no money purely because they sell basically no copies. But if a game has even a moderate success, it looks like Steam’s cut will be 30%

You are just wrong. Its 15% until you have more than $1M in revenue.

Then the sources I found were out of date.

What sources did you use?

Looks like you just misread it. The linked piece supports what I said, and nowhere says what you claimed.

It seems like you were talking about Apple, and I was talking about Valve.