What are the biggest mistakes companies make with Wikipedia?

The mistakes that produce the worst Wikipedia outcomes are predictable enough to enumerate. Promotional tone is second: language that reads like marketing copy gets reverted on sight, and articles that contain enough of it get tagged for cleanup or nominated for deletion. Direct edits by interested parties (executives editing their own pages, employees editing the company page) violate the COI norms even when not paid. Ignoring Talk-page processes means proposing changes through edit summaries or unilateral action rather than through the disclosed COI request process. Treating Wikipedia like a press channel – trying to get talking points into the article, framing things in marketing language – produces work the community recognizes immediately. And engaging editors confrontationally, accusing them of bias or attacking their judgment, alienates the people whose support determines whether the proposed change goes through.