The collapse of the Soviet union in the late 80s gave rise to a unipolar capitalist world. That reduced the propensity of governments and corporations to share with workers the big computer-tech fueled productivity gains realized from the 90s onwards. In the previous decades it was easier to workers to negotiate better conditions, as their employees feared they would become communist-friendly if too mistreated. With fear from communism gone, corporations and governments feel free to squeeze their employees, sabotage unions, etc cetera. So productivity gains now go straight to billionaires pockets, instead of reducing the working hours for the rest of us.