Just blowing some steam off.
When trying to register to bitcointalk.org (satoshi’s original bitcoin forum) via Tor, I didn’t only get the irritating ReCaptcha, but something I never seen before:
Bitcoin Forum > Remove Proxyban
Your IP address has previously been used for evil on this forum, or it is a known proxy/VPN/Tor exit node, so you are required to pay a small fee before you are able to post messages or send PMs. You can still use all of the read-only features without paying.
Your account contains 3,545.50 units of evil. To atone, you must pay a total of 0.00240385 bitcoins (2.40385 mBTC; 240385 satoshi). Pay to the address ------------. Once you have paid the full amount, wait a few seconds and then reload this page. If the fee is so small that your wallet is unable to send it, you can send any larger amount, though you will not be refunded the difference.
Alternatively, any forum staff member and some other notable members can manually whitelist you. Paying the fee is probably easier/quicker, though.
If you find any bugs in this system, email pbbugs-J6X0kjVn@theymos.e4ward.com. For example, send email here if your payment is not registered an hour after sending it. (Note: exchanges often do not actually send transactions until long after you submit a withdrawal.) The mere fact that payment is required for your IP address is never a bug. You will be permanently banned if you send email here requesting free whitelisting.
People commonly say, “I haven’t posted anything before, so why on Earth am I banned?” You are not banned. Your IP address was previously used for evil, so everyone who uses that IP address has to pay this registration fee.
So in short they ask for about $25 to “atone” my account from the sin of coming from an exit relay. I mean, I did pass a very long ReCaptcha designed to protect against bots, why further punish Tor users?
Edit: I then tried with another VM, configured with a Tor->VPN setting. The ReCaptcha was much easier (only one series of images), and I don’t have to atone. It’s amazing how many times this setting saved my day.