A cooperative will not solve the problem of a company eventually making a decision that some group of users will not like.

There exists exactly 0 business structures that can solve the problem of 100.00% of a userbase being completely satisfied with all decision-making.

You are describing normal public shareholding.

Soon those users will stop caring about the product that they use, but rather about the value of the underlying share/s.

No. I don’t care what their corporate structure is. I just don’t get attached.