nostr:nprofile1qqsgydql3q4ka27d9wnlrmus4tvkrnc8ftc4h8h5fgyln54gl0a7dgspxdmhxue69uhkuamr9ec8y6tdv9kzumn9wshkz7tkdfkx26tvd4urqctvxa4ryur3wsergut9vsch5dmp8peszrthwden5te0dehhxtnvdakqtxjx6r why don’t all Square POS systems have an opt-in bitcoin payment option? What are the barriers?