It's not necessarily always true that corporate donations are simply to bribe politicians into doing their bidding (which is what I took away when I read your commend). Companies will give money to politicians who are already aligned with their interests.
I watched a video once which tried to address the idea that Ted Cruz was being bribed by Comcast. Once of the arguments put forward was, sure, he may have received donations from some Comcast employees. However we shouldn't conflate that to mean Comcast was paying him money. Other politicians like Hillary and Bernie also would have received donations from Comcast employees.
Also, opponents of Net Neutrality actually do make some good points against the role of government in regulating the internet. Here's a debate where Nick Gillespie (a libertarian) and Michael Katz argue against Mitchell Baker and Tom Wheeler on whether NN is good. By the end of the debate, Nick and Michael are able to convince more people to consider opposing NN than to support: