Originally Posted by StarkReality

Right, you can easier spam a linkex site without captcha.

Sure, it looks for the backlink, but heaps of worthless orphan page backlinks won't help you in any way. Feeling safe, just because you get a backlink is a big mistake...shitty backlinks in exchange for good ones isn't a fair trade.

While captchas don't prevent spam, it requires some knowledge to circumvent them, it's pretty easy but most spammers don't bother and go for sites without them.