No, never ever.
Consultants 500 single mission is to help connecting businesses in search for a business advisor with the right person for the job. After a match has been made you can do business with each other in any way you like.
As such, it is Consultants 500 explicit goal not to interfere in any way you do business with each other, because you know best how this should be done and how you would like to do this.
So it is fully up to you whether or not you do business with each other, how you do this and how you make sure that projects are delivered and / or payments are made.
See here, for some general tips on what to do when you want to hire a Business Advisor or start doing business for a Client.