Money is just a tool to represent value. Value is not a zero-sum game. If a person creates something of value, she is creating something that did not exist before.
For that item to have quantifiable value to others though, they must be willing to exchange their money for the new item. The money that is to be exchanged already existed and is supposed to be limited in supply via fiscal policy. If the majority of that supply is owned by a small group of people the value that can be exchanged for the newly created item is limited as well unless those with the wealth want it.
Assuming that the monetary supply is fixed, then there is a deflationary effect. Even those with less money are able to purchase more value as more value is created. This is why incentives for creating value are important to an economy as opposed to just increasing the monetary supply.
Its not free. You are the product. Advertisers pay google and google is then able to provide the infrastructure to provide your entertainment. Its provided to you in hopes that you will buy something based on the ads you are shown. It must also be effective advertising if people continue to pay for it.
