What do you mean by they have no choice? Societies have different views and values, and the most intransient of these tend to be reflected in their laws. Companies can offer their product while avoiding politics by simply obeying the laws of a nation. For instance online pornography is a political topic yet the answer is clearly determined by nations: very illegal in Saudi Arabia, kind of legal in the UK, completely legal in the US. Companies can respect cultural views and values by simply gearing their behavior to obey the laws of the nations in which they operate. Since some people would prefer to avoid seeing pornographic results regardless of laws companies can offer an
option to remove such results - which is exactly what they do. Nice, simple, no involvement in politics except perhaps determining whether 'adult results' should be opt-in or opt-out.
The last 'people' you want involved in politics are mega-corporations because they are one of the few groups that actually have the power to manipulate elections, corrupt politicians, and generally break democracies. In my opinion it's likely that the world will gradually 'progress' towards worldwide overt corporatocracy, but there's no reason we should embrace this in any way shape or form on the way there. If nothing else your post is a strong argument for why companies such as Google should be broken down. But, getting back to the original point, I think it's possible if not likely that that's already impossible -- thanks to their involvement in politics and the influence it has undoubtedly gained them.