03 after some time period (1-2 weeks) moderators can give some rating about the project comparing all the comments. and if the project is less than minimum rating moderator will delete the announcement
To prevent abuse of power by mods and impose their views on the community, I do not think that the Forum puts any restrictions on creating/deleting topics unless they are against the rules of the forum.
Also, I do not see the point where all are allowed to share and evaluate.