The signature file is a review picture. If they pass, they will pass. If it fails, it will not pass. It has nothing to do with your account. Only posts that violate the rules will be blocked.

Some people say it's manual audit, others say it's machine audit, but after all, it's Baidu's business. How can we ordinary users know?

I think it should be checked manually, because the text is blocked, but how to block the picture?