Okay so lot of you seem to be very confused with the details.
That's because the thread is now attracting the Cryptotalk spammers who don't actually read your posts or the replies before spamming. You can safely ignore them all.
But i thought if i deposit btc into that btc address that gambling site ask him to deposit into, i wanted to know... would they be able to tell wait a minute.. the btc coming into us is coming from a btc address that another user previously have used to deposit btc into his account many times. Does that make sense? The thing is could they flag that somehow?
Yes, yes, and yes. Yes, they will be able to tell the same address is depositing to two different accounts, and yes, that might be enough to flag the account. As I've said already, no one here can tell you if they will
definitely flag the account, as without the name of the gambling service, we don't know what their policies are. The only way to get a definitive answer is to look at their Terms of Service and see if multiple accounts are mentioned, or to email their customer support.
If that is the case, wouldn't that mean that other gambling site would notice they receive btc from users who use the same btc address assuming the other gambling sites pay out btc from the same btc address to their customers?
Sure, but it is trivially easy to look at an address on a block explorer and be able to differentiate between a personal address and the hot wallet of some large exchange, gambling site, or other service.
So how long does that take and how much money does it cost extra?
If you use ChipMixer (which you should) then the fee is whatever you want it to be (pay what you like/donation) and it only takes as long as the transaction does. The mixing is essentially instant.
So that mean when btc goes to other wallet such as coinbase or anyone, they can't see it originated from my btc wallet?
Correct. If you use a good mixing service, there will be no obvious link between your original wallet and the coins you are depositing.
Wouldn't it also look fishy to coinbase though because it would look like the transaction is fishy if it was used through a mixer which could have them freeze your account?
Only Coinbase can decide if mixed coins are "fishy" enough to warrant account closures.