@EvanHahn In the video the person has uBlock Origin active so I’m wondering if it’s ad-blocking detection code that is being run (perhaps only on non-Chrome browers, given Google will be blocking uBlock origin from working).
But, yeah, beyond the screencast evidence it’s hard to tell since we don’t have algorithmic transparency. They could be serving different code by location, A/B testing ,etc., etc. I have no way of knowing I’ll get the same page the person recording the screencast did.
@EvanHahn So all we can say is that at least for the person who was recording the screencast, changing just one variable (the user agent from Firefox to Chrome) removed the 5-second delay. So, we have at least one documented piece of evidence that YouTube behaved in this way.