Currently, Coinbase and Bittrex are no longer secure. Bittrex is having very low volume and is showing signs of release from the management team, they seem to have no recent events. It looks like they are about to let go of it and create something new. As for Coinbase, only Americans should use it, in addition, we should not use it. There have been many cases of account lockout for no reason and no one to support to get back the account.
Why tell you tell that "Currently, Coinbase and Bittrex are no longer secure". What is the point here?
Sure not all sites are good for exchanges There are many exchange sites in Crypto that will not be called off but currently the number of scams has increased so the best sites are Exchange Coinbase Bittrex Binance the three most reliable and many Popular.