I normally wouldn’t weigh in on discussions like this because it’s laughable to think that valve is going to spend time and money going after people who make less than minimum wage creating or modifying maps for money.
This being said, I simply felt I had to respond to your post because of the irony.
To tackle your first point, your analogy is incorrect, possibly because you have misunderstood the quoted section of the steam subscriber agreement. It’s perfectly fine to make money through mapping, as it is also perfectly fine for a mechanic to repair cars. The difference is that the agreement says that you can’t do it with their tools. Consider if Tesla released a special toolkit for repairing cars, but said you can’t make money by doing work using this toolkit on any other cars but their own. This is perfectly reasonable right? Now consider if they had instead said that you can’t make money repairing any cars with this toolkit, even their own. By the same logic, this is also perfectly valid, and this is also a closer representation of the situation than the one you posted. The quoted section only makes reference to making maps using Valve tools.
For your second point, I completely agree. This clause is only their to cover themselves incase they want to use the right that they have reserved for themselves. That’s the entire point of the agreement. They can choose to act if they want to, but are in no way obligated, but this doesn’t make the agreements made within any less valid.
As for your closing comment, referred to above in this post as “the irony”, he is causing no panic, and from what I can tell, it is you, not him, the one spreading misinformation.