I think the point 4 is in appropriate because some managers will pick only selected participants with good quality posts in that case form is not needed.
But even you can have more points like do not apply if you found mismatch details of the project team and flaws in their website like that.
If it happens then they might be reputed manager. Like who achieved full member or above. They will not do spam knowingly. As they know how value on their membership. Maximum spam posters are brand new, newbie. Also there are many jr. member who try to spam.