The Lessons Not Learned.

[LianaThorne]

A person engaged in covert advertising. The shill attempts to spread buzz by personally endorsing the product in public forums with the pretense of sincerity, when in fact he is being paid for his services.

A shill, also called a plant or a stooge, is a person who publicly helps or gives credibility to a person or organization without disclosing that they have a close relationship with said person or organization.
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Just gonna leave these here because it's kinda laughable when people throw words around that they don't know the full meaning to. To be a shill, you kinda need to be in close association with/hired by the company in the question. It's not just anyone with an opinion that doesn't match yours & is in favor of the game is a shill.
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Oh this one is great for shill too:

A word used by conspiracy theorists when they are losing an argument.
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Thanks for coming to my TedTalk, have a good day.