It seems to me that before you contact with such projects, you need to check their audit reports. Some companies are doing this quite successfully. 
Yea.This is very good decision. You said abot companies. What do you mean,do you know any?We need to ban all paid signature campaigns in order to remove all financial motivation for this crap.
In fact, at this point, I would totally support just turning off all the signature functions. No signatures anywhere. No financial motivation. Problem solved. We get back to being a community of Bitcoin enthusiasts instead of a forum overrun by a total shit storm of fake posts.