Yup. I used to post my practice models in Freestuff at a few places... until I found a slew of them converted to some game format for sale (including my handpainted textures) at a site. The only restriction I ever put on them was "no redistribution", which was obviously ignored. Now I just give them to friends. You want to use one of my couches in a commercial render you get paid thousands for, that's fine. You built the scene and did the lighting and render. But you simply run it through a converter and sell the mesh? That's not all right. And that's not what I meant by ok for commercial use.