Seriously, people voice suspicions about corruption and bribery on the internet thousands of times every day. Rather specific suspicions about specific people, which is a lot more than what the ancestor post did.

How many /r/politics or /r/conspiracy or /r/occupywallstreet posters have been sued for libel? There is no realistic risk that the ancestor post will have to test his theories on libel in court; it just flat out isn't going to play out that way.