I think that is a fair question. I'm willing to consider limits on public spending by corporations but I find the implementation problematic.
Then again, the current staus quo is inherently problematic. Extraordinary citizens with limited means are largely precluded from the upper echelons of politics. Elections are very, very expensive. Aside from unions the only basis for the wealth necessary for publicr office at the federal level comes from corporations. Absent any change the status quo will ensure that they will always have more speech and more influence. It is foreseeable that many of the rights that govt cannot infringe, corporations will be able to infringe. Unelected power to dictate what we can say and do. Freedom, in many if not most contexts, only means that govt cannot infringe on our rights. Outside of govt the rights of speech or action or movement do not exist.
Corporations could, theoretically, require contracts limiting what we can do on our own time. Freedom of association? Freedom from unlawful search and seizure? It's been pointed out in this thread that freedom of speech isn't an inherent freedom outside of govt. Why should most other rights not also be like speech?
The Declaration of Independence is not the constitution. The United States does NOT recognize or guarantee inalienable rights beyond life and some very, very limited rights of liberty (you cannot hold someone against their will). If a corporation required you to be in bed by 9:00 pm, that you cannot engage in risky behavior or that you cannot use the internet then they could. Again, these are not inalienable rights.
Your only right is to quit your job. If the trend toward monopolies continues then that right will diminish considerably. Instead of imprisonment the punishment of the unelected power will to keep you from making a living.