Not sure why he would question the integrity of the website if he was promoting it, to be fair. Could be an elaborate scam though...
Because they're trying to be subtle about it?. I encountered some cases where a user lashed out and/or overly defended the said service or product when users pointed out (valid) the negative things about it. There's also the easy one where the op's posts are mostly about what they're asking.
I'd say there's always a possibility that it's all just a scheme to promote the said service or product but there's no way of knowing unless they started showing some signs and it would be wrong to automatically accuse everyone who opens a legit check thread.
In any case. It would just backfire if a scammer tries to promote their site using such method cause the members would point it out.
