This question has been bugging me for some time. I always picture launching my site, and some dirt bag coming on and uploading porno or spamming profanity. So I decide I don’t want him using my site, I ban his account and ban his ip in my cpanel, but what if he is using a proxy and just keeps making new accounts to harass me? What can I possibly do to prevent this horrible outcome?
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Well, if it’s not problematic for normal users, you could block IPs/IP ranges which are known proxies. However, if any of your regular customers are behind one of those proxies, this won’t work.
In general, however, unless you require registration with some form of hard-to-duplicate linked information (such as a validated phone number, credit card number, et cetera), it’s going to be hard to prevent proxying from a determined user.