I don't mean to disagree, per se, but I don't think this is exactly a fair statement. Making a successful business out of selling bingo cards to teachers on the Internet is actually pretty ambitious as far as I can tell. Yes, the bingo card production itself is basically RNG on Rails, but that isn't what made him successful. I could put up a precise clone of Bingo Card Creator and it wouldn't even pay for its hosting.
Put another way: If I picked some crappy niche and put up "Hello World" attached to a built-in algorithm, do you really think I'd do as well as he did? (I don't think desire is the difference, as I certainly desire for that to be true, in much the same way I desire for ice cream to not have any calories.)
He did an amazing job with practically nothing — do you really disagree with that? It's obviously not impossible, but it's certainly not normal or the preceding statement wouldn't be true. Painting it as impossible is wrong, but trivializing it has the opposite effect of what you want: It makes it look more impossible than it is, because it isn't actually trivial.