Earlier quoted context omitted.
This is an interesting point, but I don't see how it relates to Google doing away with 20% time.
Just watching as an interested outsider for all these years and partly based on the paper quoted above, much of Google's early energy and innovation was based on the simple idea of extending and applying knowledge of the new field in service to users. When that focus shifted to exactly what Page and Brin had criticized themselves in 1998, we can clearly see that it's not the interests of the users being served anymor…
Of course, putting it behind a paywall would have been a failure. But they could have possibly done a freemium model, offering better and more detailed search capability for a small monthly or yearly fee.