I hope you don’t want an honest answer to that question.
I use a lot of online art for my laser projects and can usually find the same or in many cases BETTER pictures that are royalty free and not watermarked or copyright in any way.
Such as shutter-stock etc quite often mark many pictures that are already public domain as theirs when in fact they are not.
Sure you might have to take a little more time to get to the good ones but in my experience it is worth the effort.
And how hard can it be to flip a picture to grey-scale…wait don’t answer that as it is something I do all the time again for my laser work.
Not a weather picture but one often claimed by many sites and watermarked. I found 7 versions all not marked and most of those from reputable sites.
You can also find the same image on multiple PAY sites…They don’t ALL own it.