It really sucks to see your own work posted by somebody else without a mention of the original author or at least a link to the source. This way it seems that he is the actual author and he is actually not, and on steemit he might actually profit from doing that.
Most authors that make content, whatever it is, and share it usually do not ask for much... a mention is usually enough, but not doing even that and you finding out by stumbling on your own content posted by somebody else can really make you mad.
I wonder if reposting somebody else's content on steemit should actually count as commercial use?