Yes, they can work well in matching repeat sellers (e.g., miners, or those who get paid in bitcoin) with repeat buyers who prefer to trade KYC-Free and with cash.

Even though there are KYC-free P2P trading platforms like Bisq, LocalCoinSwap, LocalCryptos, HodlHodl (outside U.S.), Agora Desk, etc. there's not a lot of in-person cash trading. It doesn't take long for a repeat seller to get more requests from buyers than the supply, so those sellers stop listing on the P2P platform. But the trading continues. Same for Telegram and Whatsapp trading groups in certain regions (e.g., Hong Kong, London, Tapei, etc.) where a lot of in-person cash trading for bitcoin occurs but those traders don't even need to list on a P2P platform.