No reason really, and the video doesn’t suggest they’d be unable to. Its title is doing that regular clickbaity style of YouTube, but the content itself is interesting if you wondered what went into making these small games, and how some grew in size later in the NES’ existence as more was added to cartridges to enable more involved games.
Pulling the background link here to save people some clicks: https://buttondown.email/ninelives/archive/the-coming-enshittification-of-public-libraries/
With a few quotes to highlight the frustrating situation:
Emphasis added.
Emphasis added.