The problem there is getting the initial seed funding. Investors put money into companies because they want to have control over the company, and they can't do that with a cooperative. There is a systemic bias towards capitalist company structure because of that.
The reality clearly demonstrates that investors don't bother investing in coops. You've obviously never actually tried to get investors to invest in a coop.
If you ever try starting a coop you'll find out how hard it is to get investment in practice. It's kind of hilarious that you think nobody thought of these obvious things to try before you.
Plenty if you study history and anthropology. How do you think humans lived for millenia before the invention of currency? You do realize thousands of years separate that from advent of trade and long after we settled down to form permanent communities?
Nonsense. There is no returning to small-scale egalitarian societies. Large-scale societies are a trap; once you embrace them, you can never go back apart from in extreme isolation. Spend even 5 minutes thinking seriously about it and you will see why it's a pipe dream.