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Trading: who takes the money from CAC 40 Or DAX 
I am guessing that when you say "FRENCH40" and "GERMAN30" you are referring to the main French and German stock market indices.  The main French index is the CAC-40 with its 40 constituent companies. The main German index is the DAX, which has 30 constituents.  The US30 is presumably the Dow Jones Index which also has 30 constituents. These are stock market indices that are used to measure the value of a basket of shares (the index constituents).  As the value of the constituents change, so does the value of the index. There are various financial instruments that allow investors to profit from movements in these indices.  It is those people who invest in these instruments that profit from price movements.  The constituent companies receive no direct benefit or profit from investor trading in these instruments, nor does the government.