So if blockchain.info isn't considered an secure wallet, why a lot of people use this wallet? Dumb?
There's a lot of wallets there, if one day this site got hacked, the bitcoin price will go to the ground...
The reasons why people still use blockchain.info even though its not listed on bitcoin.org, i think due to the blockchain.info is the first wallet they created, we all know that many newbies get in to the bitcoin used blockchain.info for the first time, maybe they are too lazy or feel good enough with it's feature. Or they never try out other wallets so they will never know what is the safest wallet for them, blockhain.info might be safe but if the site is down, do you still have access to your coins?
Well, firstly it is not that only wallets listed on Bitcoin.org are good or the best. Secondly, it is not that blockchain.info suddenly became a worthless wallet it is still the same.
A far as I know there is no documented hacking incident where service itself was hacked - only cases when users failed to protect their credentials so hackers could get access to their wallet.
