I doubt you'd get paid hosting customers with free hosting. It's worth a shot. You need some kind of compensation for offering free hosting. Maybe ads on the forums with post 2 hosting or ads on the pages. Somebody has to pay for the servers.
we ran a free hosting service for a while. Without verification it got filled with nasty stuff. With verification we still got some abuse but the biggest factor in ultimately canning the service was that you get next to no converts to paid hosting.
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