After years of proofreading, I have a long list of recurring mistakes. Here are the ten most common. Each one looks minor, but together they turn an expert review into a text nobody believes.

1. Inconsistent “RTP”

The abbreviation is written in capitals: RTP (Return to Player). Variants like Rtp, R.T.P. or rtp look careless and give away an author who doesn't know the topic. The same goes for jargon such as FS: in player-facing copy, write “free spins”.

2. RTP as a “chance to win”

RTP is the theoretical percentage of stakes returned over a very long run. It is not the probability of winning and not a guarantee that “you get 96 back from every 100”.

How to write it: “The slot's theoretical RTP is 96.2%. This is an average over millions of spins; the result of any single session can differ significantly.”

3. Outdated bonuses

The most common factual error. The operator changed wagering from 35x to 40x six months ago, but the review still shows the old numbers. The player signs up, sees different terms — and trust in your site drops to zero.

The fix: an “updated on” date in the text, a link to the operator's full terms and a review of every page at least once a quarter.

4. Made-up or vague licences

“Curaçao licence” without a number, or a “Malta licence” the operator doesn't actually hold, is not just a mistake but a reputational risk. Check the regulator's register and state the licence number.

5. Promises of winning

“Guaranteed win”, “easy money”, “risk-free” — phrases like these break gambling advertising rules almost everywhere. More on this in my article on stop words.

6. Inconsistent terminology

“Free spins” in one paragraph, “freespins” in the next and “bonus rounds” in a third. Pick one term and fix it in your project glossary. Mine is in the iGaming glossary.

7. Currencies and numbers without a standard

500EUR, € 500 and 500 euros in the same text — not good. For English copy, stick to one format: €500, a decimal point (96.2%) and a comma for thousands (10,000).

8. Pros that aren't pros

“User-friendly site”, “huge game selection”, “fast payouts” — without numbers, these are empty words. Better: “over 4,000 slots from 60 providers”, “crypto withdrawals in about 2 hours on average”.

9. No cons

A review without a single drawback reads like an ad. An honest con (a high minimum deposit, no live chat at night) makes the whole text more credible.

10. No 18+ disclaimer

A small thing that gets forgotten all the time. A responsible gambling block with an age restriction and links to support services belongs on every page that mentions gambling.

Good iGaming copy isn't just about commas. It's about trust — and trust converts into sign-ups.