It sounds to me like you're just describing a tech company.
Software needs to be elevated, credentialed, regulated, and more respected. This is what a guild would enable. But I think merging benefits of unions with the prestige of a guild would provide some needed innovation in that space.
Providing skilled professionals with an army of lawyers, professional insurance, income guarantees, healthcare, lead management, all with cooperative ownership, profit sharing, etc is a drastically different incentive structure than existing organizations.
You haven't convinced me that this is a thing desirable or plausible. You keep mentioning benefits that I feel I already have. You haven't convinced me that the technical output would be better than the current system. You haven't convinced me that there is a place for this in our current world, or that their is a reasonable growth path for the idea. In fact, the discussion is largely abstract. I wish you all the best with your idea, maybe there is something here than just isn't getting through to me right now.
The issue I am thinking about and solving for is the fact that I believe there are thousands, tens of thousands, hundreds of thousands, maybe even millions of Einstein-level intellects who are completely unknown, under-utilized, and lost in the current system.
With the resources (including intellectual resources), we are far in excess of what is necessary to be a multiplanetary species. Yet here we all stand, upon our home planet, with minimal access to space except for a small exceptional few. It is a gross failing to be destroying this world with industrialization while there exists dead worlds with bountiful resources.
And that is the beginning of the problems. The current structure pays even top-level tech workers a pittance compared to the ruling class, and that ruling class has no vision for the future of humanity beyond their own wealth and prosperity. They are driving our kind and our world straight off a cliff to oblivion while utilizing the planetary resources for their own vapid pleasure and security.
Perhaps, if you cannot see why I say this, you may consider walking a mile in the shoes of common people. This planet is in need of a competent technical class with a collective mission of uplifting, enriching, and enlightening with technology. The technical class are the true leaders / managers of resources, and within it exist the means to maximize beneficial traits while minimizing destructive traits.
In any case, these are just words. I just hope that when paths open up, we all can recognize it and travel it.
Open source is basically this in a naive and unorganized way, especially when MIT licensed (a giant con in my opinion). GNU does much better. But if there existed a guild license connected to tech and patents that are must haves, it would tip the balance.
The guild would offer objective security to a worker — health insurance, income insurance, and legal backing, with intentions aligned entirely with the worker. It provides a behemoth aligned with maximizing the rights and income of a worker. That would do a whole lot in attracting people to join.