Twitter went down all the time and yet stomped all over its competitors, all of whom had far better uptime. Digg was outsourced for rock bottom prices. Facebook and WordPress are mountains of PHP code.
The reason those educational software products aren't selling has nothing to do with the fact that they were offshored and everything to do with poor market fit or marketing, I guarantee you.
I have a relatively who consults for a big publisher on these offshored educational software products. None of them sell.