By Allison Morrow, CNN New York (CNN) — For years, the crypto industry has tried to shed its affiliation with crime while marketing itself as a safe alternative to traditional banking and investing. But once again, a record-shattering heist is deepening concerns about crypto’s vulnerabilities. On Thursday, the world’s biggest crypto exchange, Binance, saw more than $6 billion siphoned from its system in the span of about 20 minutes. About half of those funds were linked to a kind of cryptocurrency known as stablecoins, which were quickly frozen by the firms that issue them. The other funds were tied up…