The phrase describes one thing only: whether an operator is connected to the national self exclusion register used by UK licensed sites. Everything else people assume it means, from lighter checks to faster payouts, varies site by site and is worth separating out.
What the scheme covers
Registration with the scheme blocks accounts across every operator holding a UK licence, for a period the person chooses at sign up. It is administered centrally rather than by individual sites, which is why it applies uniformly and cannot be lifted early by contacting an operator. Anyone currently registered signed up deliberately, and sites outside the scheme do not query that register.
What sits outside it
Operators licensed elsewhere are not connected to the register because the obligation applies to the UK licence rather than to the market being served. Alongside that connection, several other requirements fall away: deposit limits become optional rather than mandatory, affordability checks follow the rules of the issuing jurisdiction, and a complaint that cannot be settled internally goes to the authority that granted the licence instead of to a UK body.
What applies regardless
Identity verification does not disappear. Anti money laundering duties attach to whoever holds the funds, so documents are requested at some point before a withdrawal clears, usually at the first cashout or above a set threshold. Age restrictions apply in the same way. Terms governing bonus forfeiture, maximum bets and withdrawal ceilings remain contractual and enforceable, and in practice they are where most disputes originate.
What to establish before registering
Three things are worth confirming while the account is still hypothetical. First, the licence number and the authority behind it, checked in that authority's public register rather than taken from a footer badge. Second, whether the site names an external body for disputes, since where none is named a disagreement ends with the operator. Third, which account level tools exist for deposit limits and self exclusion, because those are the only controls available once the national register is out of the picture. Each listing above records all three.