Holy crap. They opened-up their entire stack! You can literally spin up a clone of the site.
Obviously the only real risk to their business would be if someone else completely outdoes them, like does everything they do and better with their codebase. Simple clones are competition. Yes, competition makes things harder. But isn't competition what all these capitalists say is the answer to things anyway?? These guys are among the few non-hypocrites.
Will they be able to combat them with better code?