The team is trying to identify which wallet are still active and are able to claim dividends. If someone did forget to claim dividends, I guess they can assume the owner has already forgotten his private key and could not claim anything - I wonder where those ETH supposedly a dividend will belong to.
The team must set it up like TAAS did, that we need not to claim but sent automatically.
It is not the team business to know if one account is active or not, some people have not moved their Ethereum tokens even after ICOs, once the account is holding ETBS tokens it deserves to be paid dividends.
But why are they requiring private keys to claim dividends, if they intend to send dividends, they can set it to sent automatically without the need to private keys which is a security threat for us holders. People with bad intentions can take this as an opportunity to take our ETBS and the tokens in our MEW if we will be required to send out private keys every now and then. PRIVATE KEYS - its not normal to show it if you are just conscious.
If others were successful in claiming the dividends then I believe they don't see any risk before performing the actions.