Nobody can freeze your bitcoins so yes its safe. Like your wallet.
tell that to those that old btcoin in exchange or vault for coinbase, very few poeple hold them in their wallet
My myself have put my money in a certain exchange site because it gives me an ease to use my bitcoins every time I see a good price to buy, for me there is the risk but I need to take that as it is part of the venture in order to make money from trading.