This is both interesting and a terrible shame. It's interesting, because the people involved obviously have some talent. It's a shame, because they're devoting such talent to utterly useless projects.
I'm glad someone appointed you the official arbitrator of usefulness. Yes, these people obviously don't have enough perspective on their own lives; when will they realize that they should do only things that others find useful, instead of the things that they want to do?

It's a shame that so many people today waste time on frivolous things like "having an idea and pursuing it" and "learning by doing". They should be doing their duty and filling up empty slots in The Machine instead!