FYI Apple does this for $49 each, this website charges you $59.99 a pair. https://support.apple.com/airpods/repair/service#battery
Edit: updated pricing thanks to comment by tanduv
Edit: updated pricing thanks to comment by tanduv
Apple could do swaps much more efficiently due to their physical stores (where you could swap in real-time), and most people would pay a $10 premium over Podswap to have the Apple name behind their purchase.
The only thing that would give me comfort about Podswaps' business model is the fact that Apple undoubtedly would prefer to sell you a new pair rather than fix up your old pair.