So not hard to see from a purely theoretical standpoint; free/open source or similar is always around the corner to eat your lunch. Unless you can figure out "

So not hard to see from a purely theoretical standpoint; free/open source or similar is always around the corner to eat your lunch. Unless you can figure out "What, EXACTLY, is the thing that I can charge them for -- meaning that they cannot get unless they pay me for it," you're done. And that space is pretty small. Not nonexistent, but small.