Answered with numbers you can check — including ours.
Because a record showing only winners sells, and almost nothing stops anyone from publishing one. The common methods are simple: delete the losing posts, start a fresh channel every time a run goes badly, post the pick after kick-off, or quote a price that was never available.
The effect has a name - survivorship bias. If a hundred people each post random tips, a handful will show a superb record after fifty picks through luck alone. If only those few keep posting, the visible population looks skilled while the underlying process was noise.
Two things make it detectable. First, an unbroken run with no losing month is statistically implausible at any realistic edge, and should lower your confidence rather than raise it. Second, independent verification platforms timestamp the selection before kick-off and settle it automatically, so the tipster cannot edit the outcome.
The honest counter-position is simply to publish the losses in the same place as the wins. MalluSports does that: Over 2.5 Goals is currently the model's worst published market at -29.2% ROI over 15 settled picks, shown alongside the profitable markets rather than quietly dropped.
MalluSports is a free prediction and analysis service only. It accepts no bets, holds no funds, operates no gambling platform and holds no gambling licence. Betting carries real financial risk. 18+ · begambleaware.org