Here are several articles about TV ratings for this year's Summer Olympics:
The pandemic has dimmed what is typically a festive television event, contributing to low ratings and complaints from advertisers.
www.nytimes.com
Viewership of the games has fallen nearly 50% since the 2016 Rio Olympics
justthenews.com
NBCUniversal has suffered steep losses from the 2016 summer games, but they're very much in line with the contraction that has afflicted all of linear TV.
www.hollywoodreporter.com
The last article puts it in context. The decline of Olympics ratings mirror that of TV in general.
From an accounting perspective, they finally get the 2020 Olympics off the books. So the accountants are happy. The suits have to come up with ways to create make-goods for advertisers. That may mean discounted spots for the winter games. Or it could be a lot of post-olympics specials. They're all very excited about Peacock, so we may see more of the Winter Games there rather than broadcast.