In incognito or private browsing mode, you are way more likely to be blocked or forced to fill out a captcha, because the site won’t see any tracking cookies you would otherwise have.

I use youtube almost exclusively in incognito and I never get the captcha. The only negative consequence is no suggested videos show up. It looks like this:

Image

However, as soon as you watch even a single video, it gives suggestions based upon that. As soon as you close all your incognito windows, it wipes the slate clean and opening a new window and going back to youtube just gives you the screenshot I linked here. I don’t have a youtube “feed” and I like that. Again, zero captchas.