Its the free marketplace of ideas. Several people are making several things based entirely on their personal interests. You have it worded like Bitcoin is a company with limited personnel, but the phenomena you're describing is merely human action, not directed by an central authority.

No one asks "Is humanity focused on created too many websites" or insert your gripe you think may be a waste of time here. A lot of the projects you mentioned will surely never enter the minds of people outside of a few deep in the rabbit hole, but the people behind them believe in them, even if only for the few who are daily users.