There are companies like cigarette makers who's entire business is generally considered unethical, and others like big banks that could be ethical but often are

There are companies like cigarette makers who's entire business is generally considered unethical, and others like big banks that could be ethical but often aren't. I would expect this to make a big difference in the type of workers they attract. Could Facebook exist without selling as much personal data to advertisers as possible? It doesn't look like it currently, but it is at least hypothetical possible.