The crisis at Wirecard has resulted in users of its various brands being cut off from their own funds, and reliant on some one sorting out the unfreezing of the cards. There are reports of people being scarred by having their access to funds stopped dead even they have money in the bank. I don' t believe this would be the case if they were using Cash as this legal tender and cannot be refused.
Advocates of a cashless economy need to think the risks through.
This remains a salutary warning even though The UK arm has now resumed operations.