I thought about this as well. I went and registered instacaptcha.com but I never managed to do it and the domain expired. Seems to be doable. The user pays 1 u

I thought about this as well. I went and registered instacaptcha.com but I never managed to do it and the domain expired. Seems to be doable. The user pays 1 usd/month and gets 100 credits. The extension author can outsource the solving to http://antigate.com/ http://antigate.com/ and get the answer in 15 seconds.