[technion]

I just want to say - people critique every service out there that slows spam and bots. Those critiques are valid from the "it won't stop everything" view, but it clearly stops a proportion, and the wider variety of products out there the less likely a spammer will have a canned answer for a particular site.

[realaravinth]

Agreed, it's been an interesting discussion so far with lots of interesting ideas. mCaptcha is a very niche software, that will only work some use cases, but that's okay as long as whoever's deploying it is aware of its drawbacks. :)