SLA is simply an intent to provide a level of service. If that can't be met, then there'd be an agreement on what the consequence of that was. Don't meet an availability SLA and maybe you get some credit back. You can't offer a best effort for non-repudiation of data. It either is or it isn't.
Maybe trust is the wrong word. Like - yes they might say they intend to provide this level of service, but the only way they can actually guarantee that level of non-repudiation of data is with cryptographic proofs and decentralized consensus and now you've basically got a cryptographic ledger.
PoW Blockchain isn't the only technology to accomplish this, either. There's a whole host of blockchain and post-blockchain technologies seeking to corner that market - a more efficient blockchain. Hedera for example uses the hashgraph algorithm.
Maybe trust is the wrong word. Like - yes they might say they intend to provide this level of service, but the only way they can actually guarantee that level of non-repudiation of data is with cryptographic proofs and decentralized consensus and now you've basically got a cryptographic ledger.
PoW Blockchain isn't the only technology to accomplish this, either. There's a whole host of blockchain and post-blockchain technologies seeking to corner that market - a more efficient blockchain. Hedera for example uses the hashgraph algorithm.