YouTube is running an experiment asking some users to disable their ad blockers or pay for a premium subscription, or they will not be allowed to watch videos.
The problem with scraping is that while it’s difficult/impossible to block completely, it’s pretty easy to keep making changes to your site to disrupt scrapers. The work required by the scraper to adapt to those changes is usually way more than the work you put in to disrupt them.
So if a commercial site wants to make scraping unreliable and impractical, they almost certainly can.
It’s not easily block able as it scrapes the YouTube website. They’d have to stop having a website for that to happen.
The problem with scraping is that while it’s difficult/impossible to block completely, it’s pretty easy to keep making changes to your site to disrupt scrapers. The work required by the scraper to adapt to those changes is usually way more than the work you put in to disrupt them.
So if a commercial site wants to make scraping unreliable and impractical, they almost certainly can.