Well next to being perfect it might work ok in practice?
Our team put out a bounty nip that is a first step towards assurances in the bounty market: https://github.com/nostr-protocol/nips/pull/865 We also started building and designing tools to provide assurances of payment (reputational and dispute resolution). But we need more help! https://discord.com/invite/DsqRw8My4m