[justapassenger]

Who decides what’s good and what’s evil?

Real life isn’t kindergarten, world isn’t black and white. Even for things that most of people can agree are good, you’ll have negative externalities.

[amelius]

It was just a suggestion without the details carved out.

You could make it very explicit: X shall not be used for advertising purposes. In legalese, of course, so a judge knows what is meant.

[justapassenger]

Define advertising purpose. Rust affiliated organizations are advertising (for example conferences are being advertised).

Is only serving ads or also using ads not allowed?

Given that almost every single company in the world is using advertising then it becomes a hobbyist tool.

With serving - how about if I have a page/app that includes ads served by third party (like most of the world does). Does it make it also off limits?

Statements like that sound pretty cool, but ignore real world complexity.

[amelius]

This is why you ask a lawyer to write your license.

[justapassenger]

Lawyer won't be able to make those basic decisions for you. They'll be able to help write it in a way that has chance of being enforceable, but if you don't know where you want to draw the line, they also won't