Mods must follow the same TOS as everyone else, and are expected to remove posts that violate TOS.
Keep in mind, most boards have 6 mods that can remove posts. Admin and Mod Squad also may remove posts, so you can't assume 1 moderator is responsible for all the deletions.
You can appeal deletes by mods via the "Request Review" option at "My Removed Posts".
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"...Is a mod not required to be fair and unbiased when assessing all messages for TOS content and not just delete pro-company messages? ..."
"It is easier to fool someone, than to convince them they have been fooled."
For those that don't get it, it means that people need to be more careful, and do good due diligence.