I'm interested in creating something that pays people fairly (no mechanical turk type work where you're paid per item.)
I have 1000+ people, they live in over 50 countries, and the work would ideally allow them to work collaboratively with others.
I would start a file and start tossing articles into it that have snippets that seemed potentially relevant. Make a list of skills, assets, whatever and start looking for your niche.
Someone I knew on an email list once sent me money to take care of a fine for them for the state I was in. It needed to be done by a certain time for legal reasons and this was just not possible for them to do themselves from another state. It could not be paid online or whatever. It had to be done in person.
I briefly wondered if I could do sort of a reverse Task Rabbit: Instead of looking for locals who were listing specific tasks they would pay for, I could advertise myself online as available to do tasks in my location for people at a distance.
I never quite worked out the exact value position, so I never did anything with the idea. But perhaps you could do something with it.
You might also be able to make local goods available.
My mother is German. I was born and raised in the US. She continued to value certain German products that were not readily available in the US. When I lived in Germany in my twenties, she would send me money to purchase German products for not only her but some of her friends and ship it to the US.
This seems to be a fairly common occurrence among international immigrants. They stock up on favorite products when visiting family or family brings them stuff. There is probably a market for immigrants who want certain products from home but who don't have access to personal connections of that sort.
My mother didn't need a personal connection anymore after a local German store opened in her town. But you have to have a concentration of demand to support such a store locally. You tend to see "Little Italy" type areas or similar only in large cities. But immigrants don't all live in the big city. A small distributed network may be able to serve this niche.
Start by brainstorming the goal. I think you are on to something when you say you want to establish a network of collaborative work at scale, with equitable pay, and maximal impact. Best of luck!
If you have a 1000 people who feel like what they do matters, you will reach any goal faster than you can imagine.