Obviously, evaluations and comments are made like BOTs.

Sometimes a post will get several "likes" immediately after it is posted (even if the post is not displayed due to NG), or a comment will be written with the exact same text (how was it generated? etc.). Most of the accounts with such ratings have no work of their own. This is probably a mechanical manipulation. There is often a phenomenon in which all the ratings attached to a post disappear, but it may be that the management is deleting the ratings it deems to be violations. I wonder if all the ratings and comments of legitimate users are also erased at that time.