How do you plan to handle customers who don't do anything illegal as far as you can tell but who do cause abuse reports, listings on RBLs or similar? You might

How do you plan to handle customers who don't do anything illegal as far as you can tell but who do cause abuse reports, listings on RBLs or similar? You might say I'm asking about the gap between "illegal activities" and "activities that visibly illegal to the hoster".