Safety on any Tor market is part what the market provides and part what you do. Awazon provides the tools. Your habits decide the outcome.
What the market provides
Escrow that holds your money until you confirm receipt. A PGP-signed mirror list so you can verify an address. A login captcha that prints the market's own address for you to check, plus honeypot fields against automation. Vendor pages that show a deal count and dispute ratio.
What you provide
Tor Browser at Safest. A verified address, checked against the captcha every session. A unique password and a recovery phrase stored on paper. Monero when privacy matters. Escrow left intact until the package arrives. Small on-market balances.
The honest summary
The biggest risk is not the market vanishing, it is phishing. Verify every address and that single habit removes most of the danger. See getting a verified address.