The breakdown of the 500 ETH and how it was calculated can be found in the Service Fees section in the forum post for this funding request. As mentioned in the BoLD AIP, the documentation about BoLD, and the BoLD whitepaper, BoLD only requires 1 active, honest participant at any point in time to advance and secure Arbitrum One. This service fee is meant to remove the disincentive for honest actors to participate and to help ensure that there is always 1 honest actor participating. Additionally, only the active proposer will be eligible for this fee. As explicitly noted in the BoLD Funding AIP from the Arbitrum Foundation, the Arbitrum Foundation is volunteering to be the first honest actor to advance the chain and will be ineligible to receive the fee. As such, for the duration of time that the only active proposer is the Arbitrum Foundation, then none of the 500 ETH will be paid out. The service fee will only get spent/paid-out if another entity, that is not the Arbitrum Foundation, steps up to assume the role of being an active proposer for Arbitrum One (by being the first to propose an L2 state root on Ethereum).
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