Can't seem to find something relating on meta,so:
This fella posted a comment to an answer of mine, bluntly not disclosing ownership of the site he links. Going through some of his answers seems that he mainly wants to advertise his website, accuracy and answering OP's questions is only second.
I don't mind being linked to a website. I don't care if they own the site but I'd prefer disclosure of such information and I personally will not support advertisements like that!