Technically this is possible on a blockchain. Optimistic rollups for example have a week-long dispute period. It’s just that most people using blockchains have

Technically this is possible on a blockchain. Optimistic rollups for example have a week-long dispute period. It’s just that most people using blockchains haven’t needed or wanted this feature given its costs and centralization. Especially when transacting with smart contracts and digital assets: the domain asset you buy isn’t arriving damaged upon delivery. If you really want this - it is not farfetched to assume a blockchain based PayPal replacement would offer some dispute resolution for special cases such as fraud, theft.