I was surprised to find that when I pressed control-f and typed "duh" that zero results were found in the comments. However flawed the experiment might've been

I was surprised to find that when I pressed control-f and typed "duh" that zero results were found in the comments. However flawed the experiment might've been, it's obvious that if you add barriers (e.g., CAPTCHAs) before some end goal and detract from user experience then you decrease your conversion rate.