Its a bit of a grey area as people upload, share, modify and create styles there, not just a few here and there but massive amounts. From what I understand some manufacturers turn a blind eye to it, but other copyright owners have requested the removal of links to file sharing sites (literally thousands of URL's have been removed over 2000 in fact last year alone)
Its a matter for each conscience and I don't judge people either way, but for me its black and white. If someone else owns the copyright I either have to get permssion or pay them what is due. If I did not I would feel as though I was breaking the law..which strictly speaking I would be.
What I can say for certain is that if Roberts new styles appear on there, Ketron UK will be on it like a ton of bricks. Too much time and money goes into audio styles to turn a blind eye.