What a rubbish from the IOTA fanboys. Certainly it is not safe to post any private key online or use it to log into your wallet. That's why no wallet uses a private key to openly login, only the IOTA wallet does that. And as I wrote several times before, they do so without authorization.
Again, AAA: Authentication, Accounting and Authorization, the 3 pillars of information security. IOTA failed to implement authorization. And that's what they are to blame for!
This is a lie.
You are probably German, call everybody a liar, that does not fit into your small limited world. LOL
I login to MyEthereum wallet with my private key
When I use metamask I have previously input my private key and I trust metamask will not fail.
In iota you will only have to trust that your PC does not have a key logger
When you copy your seed(privkey) to clipboard, it is automatically deleted once you login to your wallet
You are blaming the tech for naive mistakes of people.
Imagine that you generate your BTC papaer wallet on these offering sites. and you do that while you are on line
you privkeys will be stolen, would you balme yourself for that or BTC network