You do not give any new input. Everything you said has already been said. Except of course for calling my explanation nonsense, which unfortunately is not only

You do not give any new input. Everything you said has already been said. Except of course for calling my explanation nonsense, which unfortunately is not only rude, but also false. Natural language is not boolean algebra or legal text. Most people think of employees when they talk about a company. Hence the word company as in "having company". What most people think is what defines a word. That's how language works. Of course you can call selling a software (everything OP listed as sold can be classified as software) selling a company. I do not want to demean what OP did. If he were to insist on having sold a company and not a software project, it would just sound a bit like the guy on LinkedIn calling himself CEO of his company, while being self-employed working out of his basement. (Not that OP does any of that, again OP did great!)