Steemit.com works wonderful for me
Yes it can shut in any momant. Your Steems can get stuck so watch it
Stop spreading FUD.
Steemit.com is non-custodial. Even if it were to get shut down, which there is absolutely no evidence whatsoever is going to happen, as long as you have your master pw and/or private keys, you can still access your coins on the blockchain using another UI such as steempeak or even run a node yourself and transfer coins using the cli wallet.