Co-ops failed miserably, after a fabulous period of success, from within. All cases that I have knowledge of failed from a terrible mix of internal suspition, scisms and excessive bureaucracy, with simple decisions requiring long meetings between members, to no success.
Share distribution often fails because people want just cash out.
Actually -
co-ops work wonderfully. Largest grocery chain in Finland (S-chain). Everywhere Scandinavia (COOP). UK. Rural America. Israel. Decades of success.
And many if not most software startups deal out shares. Great way to bind the blue collar workers.
It's the venture capital and just sometimes the grabby founders that cash out...