I store my bitcoins in a wallet, it is coins.ph and there I store up my earned bitcoins. When I don't need to cash out money, I just keep my bitcoins there. It is safe and reliable to use, and also, easy to understand how to use it. For now, I haven't verified my account so I can't cash out my bitcoins.
Same with me. I just keep Bitcoin in my wallet with a purpose that Bitcoin will bring to me more income in the future. Sometimes I change Bitcoin into cash and send it to bank. However, I recommend you guys should keep your Bitcoin in your wallet on the internet.
I don't recommend storing a lot of bitcoin in a third party app because of the possibility of them running away with it if they can. The chances of that are low but still it's better to be safe than sorry. I don't agree with you keeping your funds in a wallet connected in the internet making it a hot wallet.