No, I'm sorry, this is a horrible, horrible idea. As long as these companies are targeted by automated spambots, they need automated systems to counteract and remove spam accounts. That's just the reality of the internet arms race in the last 20 years. If you make them manually review everything, you hand a victory over to the spammers and degrade service quality for everyone.
>and have a proper appeals process.
This is a much better idea. Do this and require them to have a functioning customer service department.