This is actually a case in the Philippines because our internet service providers (mobile data internet providers) is reusing shared IP which is why almost every IP has evil score in it. -snip-
Though would it be a good idea to, let's say, instead of permanently blocking newbies with evil score, give them a 14 days restriction to familiarize themselves to the forum? Like every person who registers in an IP address with blue or less evil score will have to wait 14 days to post in the forum.
Or maybe like instead of paying the fees, they have the option to insert their BTC address and sign a message? and after registering, direct them to a tutorial on how to get a Bitcoin wallet and how to sign.
It sucks that dynamic IPs are abused so easily and that behavior lies with your ISP. The ease of changing IP just makes spamming a lot easier.
Unfortunately, the best way to deter spammers is through some financial penalty. The measures that you describe would probably put off most newbies when you subject them to such a long wait and the second wouldn't do anything to prevent spamming.
I wonder how many users that had no previous contact with bitcoin, never bought or sell any would do that for the first time just to get an access to this forum. By the way, how much is that evil fee at the moment?
Not much, but presumably some if they are low enough. Residential IPs are not as blacklisted as VPNs and Tor IPs, unless those IP in the same range happens to be spamming the forum. I would think that it would be reasonable to allow those with higher evil units to purchase a copper membership from the beginning. After all, they could get something in return for paying the evil fees.
The evil fees decay with time and it dependent on how many people abused that range of IP.