I think it's a self regulating system. If the product was so important and so many people relied on it (eg. Unity) where a cash grab by the Unity development team results in the entire community considering switching to a completely different product (eg. Godot), then I'm sure the community would rather fork the existing product and make it better. On the other hand, if the product wasn't that important or the cash grab wasn't that bad, then fewer people will be likely to fork and the current product will continue to be the mainline. Open source gives users more options which is always better.