Yes, it's the "uh-oh, 5 people downloaded that in the past hour, do some dumb captchas" protection. I often get a Forbidden slammed into my face, Pixeldrain's bouncer does not play around.
With all the great shares lately I am the third day in freeby limit so I play the captcha game a lot

I mean, Pixeldrain is probably the best on the market right now but those captchas are a joke. When you select all the crosswalks and it says "Nah, try again" over and over where some crappy AI think a corrugated metal roof resembles a crosswalk or something or when they say motorbikes and it mistakes a bicycle but you get scolded if you pick the bicycle because it's not a motorbike and vice-versa... Oof.