The one clause that lets the rest be rewritten
Almost every agreement contains a sentence allowing the drafter to change it. That sentence is normal, it is regulated in most markets, and it is the reason the terms you read are not the terms that govern. This page is about how the clause works and what it cannot reach.
What the clause usually says, and what it is doing
The power. "We may amend these terms from time to time." The breadth of the wording is the point: a clause that lists the reasons can only change the agreement for those reasons, and a clause that lists none can change it for any.
The notice method. Where the new version will appear - the site, an e-mail, a message on login - and how long before it takes effect. A notice posted only in a legal section is notice in the strict sense and weak notice in the fairness sense.
The effective date. The date the new version governs. Everything you can check about a change comes from this date, because it decides which version applies to an event on either side of it.
Acceptance by continuing. "Your continued use of the account after that date constitutes acceptance." This is the sentence that turns the notice into consent, and the reason a reader who dislikes the change has to act rather than ignore it.
The right to close instead. Many agreements pair the variation clause with the player's own exit: close the account before the effective date, withdraw the balance, and the new version never governs you. That is the only unambiguous answer the agreement itself offers.
Across one year, terms issued on 1 March, 28 August and 17 January give windows of 14, 14 and 21 days: average 16.3 days, (14 + 14 + 21) ÷ 3.
Notice by e-mail arrives on day 1 of the window; notice published on a legal page is "received" only by someone who looks, so the practical window is shorter than the stated one by however long the reader takes to look.
The arithmetic that matters: for a change effective on 15 October, the last day on which a withdrawal can be requested under the old terms is 14 October. After that, the balance and any pending request are governed by the new version - which is why the exit route in § 8.5 is worth knowing about before the notice arrives rather than after.
What a rewrite can and cannot do
- It can change what happens next. From the effective date, new bonuses, new withdrawals and new account decisions are governed by the new version. That is what variation is for.
- It generally cannot rewrite what has already happened. A bet that settled, a withdrawal that was processed and a bonus already released are governed by the terms in force when they did. An amendment is not normally retrospective over completed events, and a clause purporting to be is the first thing to challenge.
- It cannot take away a balance. A change can alter how you may withdraw or what further conditions attach to an ongoing promotion; it does not convert the money in the account into the operator's property. That distinction is separate from how a balance is held in the first place.
- It cannot override the law or the licence. A term that contradicts a statutory right or a licence condition is not saved by having been published; in most markets the regulator can require it to change and the statutory right stands regardless of the wording.
- It can be challenged after the fact. A variation that is unnotified, unexplained or heavily one-sided is exactly the kind of term the fairness tests below are built for. Being published is not the same as being fair.
Why the version you accepted is the first thing to ask for
Because a dispute is decided against a version, not against a philosophy. If the event happened before the effective date, the old terms apply and the new terms are irrelevant to it. If the event happened after, the question becomes whether the change was validly made - notice, reason, and the fairness of the new term - and both of those are answerable questions rather than opinions.
A reader who asks for the version in force on the date of the event has moved the argument to a document. A reader who argues that "the terms used to say" has moved it to a memory. The first one is decided by a clause number; the second one is decided by whoever replies last.
This is not the bonus-terms desk
There is a desk in this network about the terms of an offer: the wagering requirement, the contribution weights, the game exclusions, and what they cost in turnover. This page is one layer above it and about the instrument rather than the offer: how the document that contains those numbers can be replaced. A promotion's numbers are only stable to the extent that the variation clause and the precedence rule leave them alone.