Online gambling now dominates South Africa’s betting industry, but its most important truth remains largely hidden: it is mathematically designed for players to lose over time. Meaningful disclosure – not moral panic or prohibition – is long overdue. Online gambling in South Africa is no longer a niche activity.
It is now the dominant force in the gambling sector, contributing close to 60% of total gross gambling revenue, which reached roughly R75-billion in the 2024/25 financial year. The industry is expanding rapidly, aided by smartphones, frictionless payments and relentless advertising. Much of the public debate on gambling focuses on harm reduction, advertising limits, and how much tax the state should extract from operators.
But beneath these questions lies a more basic issue that receives remarkably little attention: What exactly are gamblers told about the product they are using? In the early 2000s, I served on the South African Council for Responsible Gambling, following the impact that gambling addiction had had within my family. That experience exposed me to both sides of the industry: the mathematics that underpin gambling products; and the very real social and financial harm that emerges when those mechanics meet scale, repetition and weak disclosure.
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The conclusions that I have reached are not grounded in moral opposition to gambling. Rather, they arise from a deep concern about the way gambling is currently presented to the public, which obscures its most important economic reality. At the heart of gambling lies a simple mathematical fact.
Every gambling product, whether a slot machine, an online casino game, a sports bet or a lottery ticket, is constructed with a negative expected value for the player. This means that, on average and over time, participants will lose money. This is not a behavioural tendency or a moral judgement.
It is a design feature. Each wager carries a built-in disadvantage, known as the house edge. On any single bet, a player may win.
Over repeated play, however, the law of large numbers ensures that outcomes converge toward the expected result. The more you play, the more certain the loss becomes. This distinction between short-term uncertainty and long-term certainty is crucial.
Gambling feels random in the moment, but it is highly predictable in aggregate. Loss is not merely a risk. It is the statistically inevitable outcome of sustained participation.
This is well understood by gambling operators and by anyone trained in probability. It is far less well understood by many – perhaps even the vast majority of – consumers, who experience gambling through episodic wins, near misses and carefully curated stories of success. Advertising amplifies these impressions, foregrounding jackpots and exceptional outcomes, while backgrounding the mechanics that make the system viable.
Gambling is often defended as a form of entertainment, comparable to buying a cinema ticket or attending a sporting event. But the analogy is misleading. When you buy a movie ticket, the cost is fixed and known upfront.
You do not risk further losses the longer you remain seated. Its true cost only emerges through repetition.
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