This is an especially cynical and petty comment, and that's coming from someone who isn't exactly a glass is half full type of person.
As someone who's launched several ventures, this solves a big pain point and it is very apparent that a lot of thought went into putting this together.
There is room for improvement, sure, but to dismiss it so casually or attribute its success to dumb luck because of a syntax error really sounds jaded.
Gotta agree with ya. There's been times I've wanted a logo or something (mainly for just playing with an idea), and I really stink at artwork. Sometimes I can get something passable out of inkscape - but it is rare.
There's no excuse for an HTML syntax error to get to production. That's very telling of the quality control and continuous delivery systems in place. Seemingly they deployed a change to production without even running it.
Cases like this remind me that success is often "right place, right time." Notch is another good example of bad engineering going far.