I don't trust any online wallet. Use a wallet where only you control over the private keys like a local desktop wallet. Everything else is suspect.
There are many wallets in online stil we can believe it. If you want to save bitcoin as a asset you go with the desktop wallet or hardware wallets. To speak about the safest concerns on Coinbase only this thread has created I believe.
When you want to say you don't trust the online wallets. You can create a own thread for it.
These kind of posts would be taken as a spam count. When the thread does not active you please do not bump the thread with any reason. I am using the Coinbase for long time I do not find any issue on using this wallet.