A workers cooperative is owned by its current workers. Are you going to argue that consultancies and law firms are not really owned by their current partners, either?
This arrangement is called a pension, and is still quite popular in areas of the world with strong workers rights.
That might be how your pension works.
Other pension schemes; eg Singapores and some other former and current commonwealth countries pay pension from the returns from 60 odd years of compulsary investment and additional supplementary investment.
https://en.wikipedia.org/wiki/Central_Provident_Fund
https://www.expatica.com/sg/finance/retirement/singapore-pen...
"Returns from an investment fund" are not the same as "taxes collected monthly", money, being fungible, can make it seem that way.