No, Bob's misconduct would potentially be provable in court based on the trustless data ledgers in the blockchain.
Really, this example just shows one way how developers could use blockchain technology to develop applications that utilize trustless data.
Imagine this same technology applied to the transfer of human organs, rather than easily replaceable ice cream.
Challenge yourself to think of other scenarios in business where trustless data might make a difference.
Maybe you'll have a valuable idea in this wide open space.