The big question is if they got there because of the tools and practices they use or in spite of them. With enough money and talent one can use pretty much anything.<p>And the problem with having to rewrite your stuff is that the company might go out of business while doing it. Assuming it&#x27;s something complex, and not e.g. reddit (which I suppose is not at all easy to build as a full product, but at the end of the day is an online forum)