Are there literally people who get college educated through simply walking-in on classes they're not paying for? Would this be more likely to work at a community college? How would I go about doing this? Would I figure out who the professors are at the college, and then contact them online to figure out when their classes are? This would be pretty based in combination with pirating college textbooks. I would teach myself computer science, physics, and mathematics through this.

Are there any anons who have been successful with this?

I think it's easier to learn when you have a professor in your physical presence. I could also ask the professor questions after class whenever I'd get confused with something. My community college also offers free tutoring, and I would likely be able to get free help from tutors.