Criticism of a company allows for players to shape the service the company is providing them to a collective's needs, wants and desires. It not only elevates any toxicity that consumers have against the company, but it allows for corporations to maximise productivity and profit if the consumers are happy.
A more localised issue here is that transparency is an issue between consumers and corporations. Having users PM instead of having an open discussion is absolutely disgraceful. It inhibits the community to call out on FUD that community managers may impose on players (even when we get called out, it really should be a two-way street); When threads are continuously being locked creates a sense of authoritarian silence of sensitive material ultimately infuriating others - people need a clear, concise and transparent explanation. It's not only delusional to think that a locked thread can shut people up, but it also hurts the company's image - As can be seen by OneLetter's obvious damage control thread.
Sure, the forum member may have spoken out of line on a fansite in regards to the structure of the Official MapleStory forums - and it was a tad too aggressive, but simply banning, locking and shutting up players, creating rules that are not apparent on the rules of conduct for forums and creating bland and non-specific hurts the viability of constructive criticism, the company image and releasing the toxicity of a community.