We had a run on new accounts in January. Everyone that setup an account before Jan 8 was delegated 30SP from the @steem wallet. The @steem wallet functions as a bank for new accounts to borrow SP from. Steemit has created over 50,000 accounts since January 1, 2018. On January 8 the @steem wallet ran out of reserve SP to deleagte; somone or algorithm changed the delegated amount to 15 SP. When I checked earlier today the @steem wallet had enough reserves undelegated to create ~22k accounts... which is 3k below the 25k a week we have been averaging since beginning of the year. For more info check out my post https://steemit.com/witness/@royaleagle/delegated-steem-to-new-minnows-fell-from-30sp-to-15sp-why