more than typically if they find offense to it, they will either tell the provider, or send you an email. they don't want to go to court either. for fineart it may be ok, if someone wants to license it - think again unless you have permission, most contracts put the ball in your court if they get in trouble. oddly you will get zapped in zazzle or cafe, but on this site or redbubble, not so much, i guess it's an art thing. but they have to find it first, and well it's easy to find and they didn't say anything yet, so who knows.
---Mike Savad