jm ã¿Ù?céldz.$rà4û,¿¬äÏruòb¬¶¡tjÜLThe memo protocol is just OP_RETURN with prefixes. Just because they don't have large amounts of traffic doesn't mean they weren't able to add new prefixes.
https://whatsonchain.com/tx/269fcb1b58f5ec2dc8d245be08fdc3c898e0f0b0214fcf93dc383008e13a9936