Don’t forget the fact that these centralized payment systems can unilaterally reverse any transaction which leads to other issues. I have known of online marketplaces that needs to scrutinize every transaction for fraud as if found to be so they coukd risk providing the service or product and getting a chargeback from the payment processor meaning a loss of income. Blockchain is immutable and avoids that completely as it gives full control to those who hold the keys.

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