I think I started rendering etc in 2010 (and uploaded stuff 2011), so back then I didn't even really think about things like copy rights etc since no one had mentioned them. I think when I was in colleague was the first time someone actually talked about the importance of copyright, so since then I've almost completely stopped gfxing/rendering (this being the reason I'm not on here much since the people here will assume I make the art for my gfx and renders, which I guess makes them question the art that is actually mine... though one would think they'd see the big difference in styles and figure it out >.>)
But yea like I mentioned before, I don't really ask for permission since when I started I wasn't aware it was a thing that was needed, and now there's a mixture of shyness, fear and laziness that stops me from asking, which is why I'd gladly take something down that I've not made, even if it's not the artist requesting it