trust:
All your private keys for the blockchain are in the hand of a single company. I know all of you love the ETN team, but one fuck up and all is gone. Think about Mt.Gox or recently nicehash, nothing is 100% secured, so atleast make it hard for the crooks that want your coins. Why is the online wallet not open source ? Why didnt they release the source before going online, so the comunity could figure out holes ? They profit massivly on opensource by forking the work of monero and then decide to close source their wallet. Now its properly to late to publish the source because its to risky.
this is at least not fully accurate. I don't know how online wallet made for electroneum, but look into myetherewallet - it never stores keys, you should have it on your machine, and upload on site just before usage.
Well this is MyEtherwallet, its online yes, you have to trust them yes, but atleast its open source, you can go check and see how the data progressed and what is stored, but you have to actually trust the website if you dont want to setup a website yourself. But on the electroneum wallet you dont get anything, its closed source, and you dont download your keystore or anything (all in the hands of the devs).