Wow, it's amazing that you have such incredible negotiating skills that you can beat out a Fortune 500 companies human resources department, their outside lawyers that make you sign an employment and terms of service agreement, and who have a boilerplate of similar agreements for all the other firms they have done this for etc.
The hubris you have in saying this is farcicial. The fact is that you as an individual do not have the skills to out-negotiate this leviathan. You sound ridiculous claiming that you do have the skills to do this. This is why unions have massive legal teams, lobbyists and so forth. You may be right or wrong whether being in a union would currently be better for you, but the notion that you as an individual have super-negotiating powers, and that only losers when faced with a pack of lawyers need their own pack of lawyers, is risible. You do not have good negotiating skills because you're too dumb and hubristic to know that you're outmatched. These companies are laughing at you in that you think you're outmatching their negotiating teams singlehandedly. Why are they hiring you? Because for every dollar you make in salary, they are making $1 + $X off of you. They wouldn't hire you otherwise. That $X you are leaving on the table while patting yourself on the back about what a good negotiator you are. By the way, workers in the same jobs, one union and negotiated by a team of lawyers, one non-union - studies show the workers who have the contract negotiated by a union statistically get a better contract, more wages etc.