Why there is no useful chart yet
Gallipoli is still pre-release, so SteamDB or other chart pages may show an empty, zero or placeholder state. That describes the state of the app before launch, not whether the finished game can attract or retain players.
What the page should show after launch
Once the game is live, the useful chart is a trend: current concurrent players, daily peak, rolling averages, weekend spikes and the relationship between a patch or event and the population. A single screenshot of a number is not enough to describe the health of a multiplayer game.
How to read the numbers
Concurrent players measure who is playing at the same time, not total sales or unique owners. Peak players show the largest observed moment in a period, while averages reveal the regular level of activity. Retention requires longer-term data and should not be inferred from one day.