Since it has come to this, besides the one that had been explained in the FAQ, I want to clarify one popular misconception about Full Marks since from the looks of it, many didn't know the mechanism of Full Marks (if you know, then good).
Misconception: Playing during FM is safe as long as you don't collect any completed tiles, keeping your score at 0.
The biggest hint here is the player’s perspective. As shocking as it may be, your board might show 0 points, and your name could appear far down the list. However, on another player's screen, your name might actually be in the top 5 or even the top 3. This is a clever move by JC to incentivize players to spend money by creating the illusion of fierce competition. The system calculates your completed but uncollected tiles and displays them to everyone in your group—except you. But they don’t stop there. Besides counting your completed tiles, they also add in the highest bonus pattern you've made on your board, multiply the sum by a lowest boost available: 1.25 or 1.5 (even if you didn’t buy one), and use that number in the rankings. Since the leaderboard updates in real time, everyone in your group actually sees your progress as a live score, even before you collect your tiles.
Bonus: For the House Pride event, reports usually come from another house. Back in the day, only the reigning house and the first placer in your group received the grand reward. Before I transitioned, I always hoped to be grouped with cheaters, because with them, my group could easily secure first place. Even if my group got reported, only the cheaters would get banned, while legit players remained unaffected. In fact, we might even receive the grand reward as a consolation gift or at the very least, a fair sum of energy.