No clear operator information
Check who formally operates the service, where the licence information is located and whether the terms identify a specific company.
Hard-to-find terms
If withdrawal, bonus or account-closure rules are unclear or regularly changed without clear notice, treat it as a warning sign.
Contact problems
A lack of response does not by itself prove dishonesty, but repeated contact problems during withdrawals or verification call for caution.
Do not add money to unlock a withdrawal
If someone demands another deposit solely to supposedly unlock your funds, stop and verify the situation independently.