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Online Ads Can Infect Your Device with Spyware
(www.scientificamerican.com)
This is a most excellent place for technology news and articles.
They have blocked users in the past from seeing any videos until their adblocker it removed
You still have the option of closing the tab and moving on with life, or digging in to see if there's another way around it.
Closing the tab and moving on with life is what I do when a Twitter login prompt or paywall appears. I've often thought it would be better for me to unblock ads, at least on timewasting sites like Youtube, just so that I get pissed off by the ads and close the tab, making it easier to stop wasting time.