When account are created, @steem account is delegating a small amount of Steem Power. It is like a loan, with no interest, that can be revoked at any time. This is needed because the allowed bandwidth in the Steem blockchain is proportional with the SP of each account. An account with zero SP, would not be allowed to add any information to the blockchain. After a while, when the accounts reached a certain SP to take care by itself, the delegated SP is revoked, returned to the @steem account and used for newcomers.
When account are created, @steem account is delegating a small amount of Steem Power. It is like a loan, with no interest, that can be revoked at any time. This is needed because the allowed bandwidth in the Steem blockchain is proportional with the SP of each account. An account with zero SP, would not be allowed to add any information to the blockchain. After a while, when the accounts reached a certain SP to take care by itself, the delegated SP is revoked, returned to the @steem account and used for newcomers.