What is “an open-source business”? I.e. what do you want your business model to be? To be precise, when your customers pay you, what do they expect, and receive, in return? This could be consulting, bespoke development, etc. That, whatever that is, is your company, not “open source”. The fact that you publish some code as open source is mostly irrelevant. No company is “an open source company”, they are instead companies with business models which allow them to publish source code under open and free licenses. A woodworking shop could be such a company if they also publish whatever software they write (during the course of their normal work) under open and free licenses.
In other words, open source is not a business model¹.
In other words, open source is not a business model¹.
1. https://news.ycombinator.com/item?id=30291919#30292595