Corporations can capture government just as much as coops. It depends which is relatively more effective at swaying policy, money or votes. In the U.S. contemporary social and political dynamics make money much more important as voters currently suck at tracking the relationship between their desired outcomes and actual policy. But at other times votes were more important. It depends on the dynamics in Italy. (Or maybe it just depends on the labor system--it's maybe not a coincidence that votes were more powerful in the U.S. when unions were big, and money more powerful when business interests dominated policy. In that sense, you can expect corporations or coops to slowly capture government, regardless.)

Though some of the Italian statistics were ambiguous as to whether they included non-worker-owned coops (perhaps even deceptively so!), the main thrust of the article was clearly about worker-owned coops

  While cooperatives in the United States claim about 130
  million memberships, these are by and large within consumer
  and producer-owned co-ops, not cooperative workplaces. Only
  around 7,000 people nationwide are part of worker co-ops.