You said it already: I can't give exact criteria because that would make abuse trivially easy. So what's left is a more or less arbitrary decision based on my gut feeling.
I got it. If you post it publicly, Spammers will take benefit from this. About feeling: Does it depends on your mode?
Administrator
theymos said about evil fees:
the vast majority of accounts that hit it should not be whitelisted.
I don't have a complaint about this. But, Since theymos said that. He should know: In my country, every time I switch my mobile data off/on. It changes my IP like VPN. I don't know about other countries. This could give me an IP that was used before here. I believe that's not my fault.
At least I've helped some really good users join the forum, which is why I volunteered for this.
How do you know that they are really good users since most are brand new and newbies? Are they alt-accounts of reputed members, or do you know them anyhow?