Maybe I'm wrong but you can't beat free...Besides, since FB is worth 112$ billion, it means it works. I don't think people care about privacy enough to pay a subscription. And don't think those websites are bulletproof.
Free definitely has its advantages. I guess it's more about awareness since many people don't really know the cost of free. But you could be right. People just don't care
Well then thats your choice. But the more incidents we have where people who don't know this end up being caught by surprise the more I think people will care and want another option.