Earlier quoted context omitted.
Well usually ReCAPCHA is usually used on sign in pages. You can rate limit login attempts, exponentially increasing rate limit (or just locking out) IPs that exceed allowed login attempts and analyze your logs to ban abusive IPs. Yeah, that's harder than ReCAPTCHA, but I think a lot of these big companies can afford to do these pretty basic steps. If you just want to throw some comments on your free blog and not have…
> You can rate limit login attempts, exponentially increasing rate limit (or just locking out) IPs that exceed allowed login attempts and analyze your logs to ban abusive IPs. Rate limiting and bot blocking are two totally different things. Rate limiting only increases the cost of a bot attack. Either they need more IP's (which are dirt cheap in the black market) or they need more time--either way it is increased cos…
Not easy for an average user though.