We can still get coins from that deposit adress or are they gone for good?
There are cold and hot wallets. Because of hacks in the past and development of technology, exchanges and platforms change from hot wallet to cold wallet for safety of their funds.
So when customers make deposit to a hot wallet, a platform will move it to their cold wallet, and credit a number to customer account. Later when that customer submit a withdrawal request, that platform will approve (or disaprove) that request, and send a number of coins requested to withdrawal address of that user.
Number of coins stored in hot wallet is not big and platforms nowadays store most of their funds in their cold wallets.
Many wallet addresses in rich list is cold wallets:
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.htmlTnx, good to know! My father explained more detailed problem, he played on both freedoge.co.in and freebitco.in sites, after doge site shut down, they offered to convert dogecoins to btc and send them to freebitco.in (still that form is up when you go to doge site), after that, freebitco.in sent email that transaction was sent to the withdraw adress in his freebitco.in profile and provided blockchain transaction (he played on that site for 5-6 years but never opened wallet so only deposit and withdraw address is the one he got when he opened profile). After that mail he noticed that btc he had on freebitco.in were also withdrawn so his profile was empty even though he didnt request withdrawal on freebitco.in, just filled out form on dogesite for conversion of dogecoins to btc in freebitco.in
So coins are on that withdrawal address in freebitco.in profile but we dont know to deposit it back to freebitco.in or transfer them to wallet we recently created, still reading forum, google and trying things but without much success....