You know, I don't much care what the Steam daily, weekly or monthly charts look like. My enjoyment of this particular game
Isn't quite the subject of this thread. Still, you're missing some numbers:
http://steamstats.madjoki.com/app/359320
http://steamcharts.com/app/359320
http://steamspy.com/app/359320
https://steamdb.info/app/359320/graphs/
There's the number of owners, which tends to vary wildly each day; most Steam stats are quite inaccurate, but that variation is way above this inaccuracy. This means one thing, not yet picked up by most websites: refunds. Only Frontier can know exactly how many refunds are being filled, but I wouldn't be surprised there are many. The average negative variation per day over the last month is of 7664 players, with an average negative of 4586 players. That's higher than normal, so surely refunds are part of the cause.
Then, there's your own numbers. Indeed, a strong initial bump, other bumps after sales and Steam keys available fo everyone and beginning of summer. And then it decreases. It's right there on the graph, and the exact same model can be seen on any other game over the same period: launch, sales, summer. As for the rest, it follows the same global activity as Steam.
But most importantly, the number of owners is estimated to be between 256k and 275k. The peak players was recorded in early july, with about 12k players, which is less than 5% of owners. The overall audience, which steadily decreases, is about a third of the owner base judging by the past few months, so either two thirds of people stopped playing the game, or they're taking rounds each month- regardless, that's not good at all. The current trend is down to a fourth of active players, when we're in the middle of summer: that's appaling.
As for total playtime numbers... some have a thousand hours of play... Frontier reports a 64 hours average on their part (
http://us2.campaign-archive1.com/?u=dcbf6b86b4b0c7d1c21b73b1e&id=a82d46dca0)... Yet the average playtime noticed on Steam is of 45-47 hours, with a median of 19 hours. It's like 10% of the community accounts for more than half of total playtime.
I've been told that Steam considers the ED launcher opened to be "playtime" too. We'd need confirmation on that, but if that's the case, I guess you understand what it could entail.
No, those numbers are not good at all. Compare them to that of a healthy game, and you'll see the problem.