its not hard to track transactions and probably much easier than most think to associate an address with most users
how you can do it? it's not easy at all, tracking back to the original address it's possible, maybe even when those addresses are mixed, but associating it to a specific person/users is another different story
is bitcoin open way forward money launderer to get safe money,i asked that because its appear that bitcoins is verry hard to control or track
As already said, it's not that hard to track.
There're other coins that declare being untraceable, but as far as I know, any bitcoin-based coin is easy to track. It's considered that cryptonote coins' transactions, though, are really imppossible to track
But to access cryptonote coins (namely Monero) you still need Bitcoin, and the Bitcoin transaction where you bought Monero with would still show up, so whats the point. Unless the Monero coins you have were mined, their origin will most likely be trade for BTC in some exchange.
you can mine cryptonote at launch, they are affordable, with a gpu like 970/980, then convert that in bitcoin, simple