You can file a lawsuit without merit about anything, you don't need merit.

I agree. I think never mentioning Lightroom is a way of steering clear of meritorious suits and reduces the likelihood of a frivolous one...since even a frivolous lawsuit could be fatal. Anyway, "here is our cool thing" is probably organizationally healthier than "us against evil corp."

By this logic, they probably should have picked a different name.