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One word: Non-profit.

Okay, it is a hyphenated word.

It does strike me some kind of worker owned co-operative would suit this type of organisation.

That's possible too. I think a few companies (in other industries) have taken this path.

That might work. Or something like the NYSE. Lower trading costs, better transparency etc.

I guess it may or may not be a non-profit. There are for-profit companies that do good, and maybe non-profits that do poorly.