My main gripe is that these massive tech companies are built on the backs of FOSS while their contribution to open source is minuscule compared to profits. They ruthlessly monetize everything as you put it: the employees, the code, your data, your time, and for what? How does this actually make our lives better in a meaningful way?
The fediverse is the next step in taking the web back so that it can start working for humans again. I hope it can stand up to big tech and the lawmakers in their pockets. We can be sure they will fight like hell when money is on the line.