Is this supposed to be like the joke "Nobody drives in New York the streets are too crowded."? If no one is writing them how can you rattle a half dozen runtim

Is this supposed to be like the joke "Nobody drives in New York the streets are too crowded."? If no one is writing them how can you rattle a half dozen runtimes that have achieved various levels of success. If anything you might ask why there are so many rather than getting behind one opensource runtime and pushing it farther rather than starting over all the time.