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Whether or not this is a good idea depends upon the species of fly. Black soldier flies (Hermetia illucens) are not a bad option. From Brave AI Search: Soldier flies, specifically black soldier flies (BSF), play a significant role in composting by efficiently breaking down organic material. Their larvae are particularly effective at decomposing high-nitrogen materials such as kitchen food scraps and manures, which they consume and further break down into forms that can be utilized by other decomposers.

These larvae are known to reduce the volume of organic waste, including manure, and stabilize plant nutrients within their bodies.

In addition to their role in composting, soldier fly larvae can be used as a protein source for animals, including chickens and fish, and their frass (excrement) can serve as a nutrient-rich fertilizer.

They are also beneficial in reducing the population of other nuisance flies by consuming their larvae.

While soldier flies are generally beneficial, they can sometimes outcompete earthworms in composting systems, leading to issues where they may take over the compost bin and affect the composting process.

However, with proper management, such as adjusting the moisture levels and ensuring a balance between green and brown materials, it is possible to maintain a healthy composting environment that includes both soldier flies and earthworms.

Overall, soldier flies contribute positively to the composting process by accelerating decomposition and converting organic waste into valuable resources.