Exploitation of human beings is not a trait of capitalism; it is a trait of human beings. You create any sort of system that can be gamed to get an unfair advantage or privilege and there will be people that will exploit it.

You can nationalize all commerce and the same issue exists. You democratize all corporations and the same issue exists.

You can't get rid of all incentives. A government is an innately alluring entity for corruption. This is why regardless of how you organize your government or what economic model you adopt, you find corruption and oligarchs.

The best you can do is to have a system that is adaptable (i.e. laws can and do change) and a system that reduces the incentives for exploitation or limit the scope of which it can be exploited.