The clause, and where it lives
One sentence, normally in the withdrawals or account section, permitting the operator to request identity documents at its discretion. It is written as a right rather than a routine, which is precisely what makes it unpredictable.
It is also why this site never calls an operator no-KYC without qualification. A sign-up that asks for nothing and a payout that may ask for everything are two separate promises, and only the first is generally being made. The anonymity question in full.

The five common triggers
A first withdrawal from a new account. An amount above an internal threshold. A pattern the operator's monitoring flags. A deposit and withdrawal route that do not match. And a bonus dispute, which brings scrutiny with it by definition.
Three of those five are within your control. The other two are not, which is the argument for treating verification as a task to complete rather than an event to avoid.
What is usually requested
A government-issued photo document, sometimes a proof of address, occasionally a selfie holding the document. At larger amounts a source-of-funds request can follow, which asks where the money came from and takes considerably longer to satisfy.
Source-of-funds is the one that surprises people, because it arrives after identity has already been confirmed and asks a different kind of question. At larger sizes it is close to routine.
Doing it early is strictly cheaper
Verifying at sign-up, when nothing is pending, turns a potential multi-day hold into an administrative task on a quiet afternoon. Verifying with a withdrawal waiting turns the same task into a wait you are counting.
The documents are identical either way. Only the pressure differs, and the pressure is entirely a function of timing.
Where the buttons on this site lead
The casino this site sends readers to
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