Is it unethical to sell a cure for a disease that another company is profiting off of by selling a side-effect suppressing medicine? Or to sell a wide-range so

Is it unethical to sell a cure for a disease that another company is profiting off of by selling a side-effect suppressing medicine? Or to sell a wide-range solution to a problem, for which previously only peacemeal solutions were available on the market? I believe these questions are no different from yours, and that all of those are ethical; if the site needs to keep track of some balance that I would have on that site, they should make me create an account before ever showing an article. Note that I'm not advocating for piracy / circumvention of DRM, but against the 'you have read your 3 free articles this month, please create an account'-pattern. If you offer free articles without an explicit user account, you should not be suprised that the anonymous user expects those articles to be free and uses workarounds to get past the toll gates.