Ok well this makes some sense -- the Gitea business model, where a pretty complex piece of s/w is developed open source primarily funded by one or more business deploying said s/w as a commercial SaaS.

But...while QB is a dumpster fire, it has incredibly deep and finicky functionality. Accountants know how to make magic "integrity override" journal entries in its data. It understands how to electronically file a W-2 report in all 50 states. And on and on.

I'd be surprised if any OSS solution ever has this richness of functionality, with the level of trust in its correctness required for money and taxes. The SaaS vendor might be able to produce such a thing but it'll end up being the "enterprise upgrade" that isn't available OSS.