the existence of oligopolies and the effectiveness of the dominant strategy. On the one hand, high rollers prevent new players from competing. Developing an app is expensive, and the high cost combined with the small market a new product will have at the start (since a leading product is most likely to monopolize the market) can be a recipe for disaster for many new businesses.
I mean, if you want to take on Salesforce or Real Estate Photo Editing Shopify users, it's not going to be cheap, fast, or dare I say easy. On the other hand, the pure dominance strategy ensures that the best competitors remain at the top because "as long as there is capital to feed it, SaaS competitors will try to enter every possible market niche, compete in every possible area of their market and for every unique customer," as the article says. So there is still some flexibility.