I've always made my own thumbs, and they're almost always cropped. I sort of specialize in multicharacter renders, and it's pretty hard to have a meaningful 200x200 thumb containing 20 to 30 people!

So in this regard the new policy hardly affects me. 

In another way I it does. I've always tried to make thumbnails that represent the underlying image, that give the browser an idea what lies beyond. I'll have to be somewhat more creative in making my thumbs (with 30 people in an image, most of them nude or semi-nude, it's pretty hard to navigate around all offending body parts...), but I can live with it.

But my own posts are not the real problem. My viewing experience is.

Under the old policy, when I saw a thumbnail that looked interesting, I'd click it. Usually the underlying image is interesting too.
With this new policy, thumbnails leading to images containing nudity are almost required to misrepresent the image. And apparently many artists don't want to compromise their work with a "wrong" thumbnail and use the standard Content Advisory thumbnail.
What does that lead to? 
Less views. Less advertising of marketplace stuff. I'm definitely NOT going to click all "Content Advisory" thumbs in search of hidden gems. 

So I am certainly going to miss out on some promising new artists. And Renderosity is certainly going to miss out on some sales. 

And this doesn't have to be. There are ways to cater to the people who don't want to view nudity at all, AND cater to the people who don't want nudity in thumbnails, but do want to be able to view the underlying images, AND cater to the people who want to be able to judge by the thumbnail what they're going to click on. 
Solutions have been proposed that would refine and better the new thumbnail policy, that would lessen the burden on moderators, that would reinforce the stated purpose of the new policy.

I haven't seen any reaction to these proposed refinements by the PTB so far. Even something as non-commital as "Interesting take on the situation" seems to be too much. I do not understand why the mods and admins systematically ignore suggestions for possible refinements while reacting to other less constructive posts.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

My gallery   My freestuff