> Given that open-source has given tough competition to every area of business software

Huh?

Open source word processors and spreadsheets? Open source ride hailing apps? Open source social media? Open source chat applications? Open source consumer operating systems?

Only in a few niches (mostly developer tools or platforms) is open source giving "tough competition".

I thought I heard Brazil had open source tax software. It would need to be sponsored and managed by the government in order to work. With open source software the liability is on the end user and a corrupted Word document is a bearable risk. Businesses pay for Red Had and system engineers to reduce the risk their systems won't boot. In addition, tax laws change all the time (and are honestly a bit subjective).

I would imagine it would have to be managed by the government (or someone with liability) but accept contributions that would be vetted and approved by the government.

It is not open-source. It is free and runs on the major 3 operating systems.

It's very costly to keep up with changing rules and is mostly a once a year need that has to be bullet proof at filing time. Not a good recipe for open source.

I don’t think your assertion is true. 99% of business software is helped by open source, not in competition with it. Business software = business logic = people gathering requirements. Not really compatible with open source