I wasn't doubting it wasn't you making the decision! :)

I was more curious why go with modifying a FOSS license (which clearly isn't the right choice if you want to prevent others from doing whatever with it) instead of just straight up keeping full copyright to yourself/the company and a "regular" license?

Then you get exactly what you want, without also sending double-messages about that people can do whatever they want, which is what you're trying to prevent.