It is quite simple, if you are not paying for the product, you are the product and even if you are paying in some cases. This is well known. Also well known, is

It is quite simple, if you are not paying for the product, you are the product and even if you are paying in some cases. This is well known. Also well known, is expect no privacy online. Always assume everything you do online is being monitored and do your best to encourage everyone you know to use encryption, or to prefer encrypted services, wherever they can.