[Videx]

if evercookie has found the
user has removed any of the types of cookies in question, it
recreates them using each mechanism available.

Sounds like malware to me. Just because you intend to use it for 'good' doesn't change that.

If you're seeing a lot of spammers register, then you're not doing enough to stop them up front. Don't use captcha, and change your q&a if they've figured it out.