I should be more clear. While it's not "illegal", it is illegal for a doctor to recommend the treatment or even mention the treatment. A doctor will try chemo and then tell you that you're shit out of luck, even though there are tons of other options. A cancer patient on their deathbed is not going to have the strength or energy to seek out alternative treatments and then administer the treatments to themselves. The problem that I have is that there is lots of suppressed knowledge and information, and it's just not right to keep the sick uninformed and unhealthy just for the sake of profits.
Yeah, there might be other options, but those options have not been sufficiently tested to determine whether or not they work, or if they could in fact be MORE harmful to you! I don't see how not recommending something that does not have any, or at least insufficient, scientific backing is unethical. In fact, I would argue that it would be irresponsible to recommend such treatments that have not been studied.
As for "keeping people sick" I think that's just wrong. How are they keeping us sick? By hiding the "real" cures to cancer? It's possible that some more effective medications and/or treatments exist, but at this point may be so expensive that they can't develop them, and even if they did, nobody would be able to pay for them! If something is so expensive that nobody can afford it, it doesn't make sense for a company to invest in it. Is that kind of shitty? Sure, it sucks that people are going to die. But it's a virtue of our economic system, and not a conspiracy to keep the masses sick and consuming.