What a normal withdrawal looks like
Regulated brokers typically process a verified withdrawal request within a few business days, returning funds via the same method used to deposit (a standard anti-money-laundering control). Identity verification before a first withdrawal is normal, not a red flag.
Isolated delay vs. a pattern
A single slow withdrawal, especially a first one pending extra verification, isn't on its own evidence of a scam. What matters is whether it's an isolated incident or part of a recurring, independently reported pattern across many unconnected customers over time.
The specific patterns worth taking seriously
New conditions invented after a withdrawal request is submitted (previously undisclosed fees, "compliance" holds with no clear resolution path); requests for additional deposits to "unlock" an existing withdrawal; support going unresponsive specifically after a withdrawal request but remaining responsive for deposits; and account restrictions that appear immediately after a withdrawal is requested.
What to do if you're facing this now
Document every communication in writing, request a clear, dated explanation for any delay, and if the broker is genuinely regulated, escalate to that regulator's complaints process directly - regulators generally require licensed firms to have a formal complaints procedure you're entitled to use.