I have some coins in some open source wallet like binance exchanges and others but I never planned to stay them there longer. When I think I have enough funds to transfer to an closed source wallet, then I may transfer it right away. More safe and reliable than the latter one. This may keep my bitcoin as my long term investment.
Yeah same with me, I guess it's good but yeah we should careful to choose exchange for save our assets. At least trusted and famous exchanges, personally I was save my assets on Indodax, I trust it because its exchanges from my country.