> supply chain commoditized stewards (for a fee)
I agree with this, but the open source licenses allow anyone who purchases a stewarded implementation to distribute it freely.

I would love to see a software distribution model in which we could pay for vetted libraries, from bodies that we trust, which would become FOSS after a time period - even a month would be fine.

There are flaws in my argument, but it is a safer option than the current normal practices.

When it is tailored to one customer, that dependency being maintained for you is probably a very particular version you care about. So while copylefted code you can always reshare, it's the timeliness and binary package archives that are where the value really is.