Non-exhaustive list of things that do not count:

A comment that contains classified plans for a nuclear weapon is deleted because it's illegal.

Someone requests their own content to be deleted, Manifold doesn't have a way to do this, they due Manifold under GDPR or similar.

Manifold themselves publishes an article on their Substack, then takes it down when someone complains.

Non-exhaustive list of things that do count:

Someone writes a letter to Manifold threatening to sue them for libel because someone posted a market that was critical of them, or actually does sue Manifold, and Manifold takes the market down.

A market about someone with a history of legal threats suddenly disappears, and Manifold refuses to provide any explanation.

I'm open to ideas on how to operationalize this better, please ask questions and make suggestions.