I do like that definition, but there's also the question of what kind of business would it be? There are companies that have to write their own software, becaus

I do like that definition, but there's also the question of what kind of business would it be? There are companies that have to write their own software, because there isn't commercially available solution that will allow them to scale. Companies like energy trading companies, banks, hedge funds, ISPs and so on. They might buy some solutions, but build others. eBay also doesn't magically become an auction house, just because they decide to buy a platform, rather than develop one. Amazon (the webshop) isn't a software company... but they write a ton of software.