I know several personal examples of people who I invited to join bitcointalk forum and they couldn't registered because they got evil fee notification and asked to pay with Bitcoin.
Keep in mind that they never before heard about bitcointalk forum, they never registered in this forum, and they don't own any Bitcoin for paying this evil fee :/
I even tested and confirmed this myself from different location, using different device, maybe because some networks are using shared IP addresses.
In the process of punishing spammers and banned users we are also punishing innocent newbies and that is a fact.
The problem you mentioned does exist, and the evil tip will not be too much, but this is a very bad experience for newcomers. Whether it is an IP problem or not, the final complaint will be placed on the Bitcoin forum, facing unprincipled The bounty hunter team, I still agree with this point. There is a saying that it is better: I would rather kill 1,000 people by mistake than let a bastard. Each has its own reason, and at the same time, we should quickly find a way to reorganize the bounty plan section.