If we are speaking about a product that I have to pay for or a paid service, then I will end up paying a share of the R&D, maintenance, advertising. If we are

If we are speaking about a product that I have to pay for or a paid service, then I will end up paying a share of the R&D, maintenance, advertising. If we are speaking about a service provided at no cost to me and the provider makes money off advertising, then I will end up paying some share of that if and only if my access to said service is charged by a 3rd party, eg a phone company that charges me for traffic, vs my home connection which is a flat rate, regardless if I use it or not.