James Howells, the engineer from Wales who famously lost 8,000 BTC in a landfill, has cautioned new cryptocurrency traders against using leverage due to the volatile nature of Bitcoin prices. His warning comes after the UK High Court denied his request to search for the hard drive containing his lost Bitcoin, concluding a 12-year legal battle. Howells highlighted that over 90% of new traders using high leverage experience rapid losses, as market fluctuations can lead to liquidation. He also emphasized the importance of proper digital asset management, recommending the '3-2-1 backup' strategy to safeguard private keys. Additionally, Howells expressed concerns about institutional control over cryptocurrencies, suggesting that regulated products might diminish Bitcoin's dominance and reduce investor autonomy.