[penagwin]

That's what I don't understand. If you're building a bot to get past reCAPTCHA then you're almost certainly in some selenium/chrome headless environment, with full chrome support of cookies, Javascript, you name it. There's certain methods of detecting such environments based on their environmental variables there were again more work around to patch those.

Also the fade is irrelevant because the bot already has access to the image without the fade (although it still has to await the fades completion to continue).