That poster said "corporations." There was no specificity about which, though I'm fairly certain that he meant only large corporations. But lumping them all together is stereotyping, and it ignores that even large corporations can and do perform good acts. You point out that early corporations were required to "provide some PUBLIC GOOD". True to a degree--by 1800, only a few hundred corporations existed, and most of them were expressly for providing public services. But even without this, there were means of the elite protecting their power and wealth through trusts and limited partnerships.
You clearly are trying to fill in what you believe are my values based on very minimal knowledge. I agree that many large corporations do not pay the taxes that they should, and that this impacts the government's ability to provide the services needed. I'm not at all comfortable with any non-human person donating to the political process, but at the same time, under the First and Fourteenth Amendments, you cannot say that one group of people (unions, for example) can express speech in a fashion which costs money while another group (corporations) cannot. I do feel that the PACs need to be reined in, as do the 501(c)(4) "social welfare groups" that are being used to provide cover for political ads.
The courts didn't find that "speech = money", as you say. But the ability to widely publicize a given viewpoint has almost always required some amount of money. Newspapers have always taken money to run ads, pamphlets cost money to print, and advertising on radio, in movie theaters, on television, and on the Internet costs money. Restricting the amount of money that can be spent therefore may be seen as a restriction on free speech. The Supreme Court did not find that this is impossible, but that such restrictions are subject to strict scrutiny: there must be a compelling government interest, the law must be narrowly tailored to achieve that interest, and it must be the least restrictive means for achieving the goal. At the time, the arguments failed to sway a majority of the Court. With the backlash from it, maybe we'll see a new amendment to the Constitution.
Finally, whether you like me or think I'm authoritarian matters little to the conversation. Neither you nor the original poster (presuming you're different people) know anything about me other than what you've read from a couple of posts. There are a lot of things that need to change in the United States and around the world including limiting the power of the elite whether political or economic, and the world will be freer and more prosperous for those changes. But there are processes to that in the US, including engaging in debate, and juvenile ranting doesn't help get your point across.