Crypto researcher Justin Bons has raised concerns about the potential impact of quantum computing on privacy-focused cryptocurrencies Zcash (ZEC) and Monero (XMR). Bons warns that quantum computers could eventually crack the elliptic curve cryptography used by these coins, potentially compromising user privacy. He suggests that quantum computers could derive private keys from exposed public keys, linking transactions to real users. Bons advises using mixing services that do not rely on zero-knowledge proofs to protect long-term privacy. He emphasizes the importance of privacy, especially for individuals who rely on cryptocurrency for anonymity. While the threat from quantum computing is significant, other experts, including CoinShares and Bitfinex, believe the risk is not immediate and can be managed over time.