I like to repeat myself. Accounts that are exclusively passive (savings accounts, overnight money, fixed deposits, savings contracts, savings bonds) do not lead to Schufa entries.
It is different with contracts that can lead to a debtor-creditor relationship for the investor (overdraft, securities accounts, credit cards, etc...).
Therefore, I take the bet and say: pure savings accounts do not lead to changes in the Schufa score. Neither positive nor negative.
Bet: An ice cream or beer at the next meeting.