I will understand why a client may not trust a freelancer. To be honest, it may be difficult to get them trust truly. It is difficult to trust a stranger with your tasks and even your money in many instances. That's why it is always better for the clients to make sure that he's checking out the freelancers that he can trust. He needs to check their portfolios to understand and as well make sure that they check their reviews to know more about the freelancers