This graph one is from itch. Regarding Steam, it has always been a paid version so there is nothing to compare.Interesting statistic, thank you for sharing.
What happened at the peak in erly july/june?
If it's from this year it can't be steam release.
Also interesting to see that so many guys claim to want to support the creator by subscribing to his patreon, yet it gets a solid 0% in the poll.
The 0% is not representative, it's a Patreon poll and there are not many answers, so there is that. But clearly many players are there for the exclusive features, that much is clear. Patreon-wise, it's like this:
You can see that there was a stable amount of people supporting the game without asking for anything exclusive during the early stages of the game, and then it started to stagnate. Exclusive features started a second growth afterward.
The arrow is the same moment in time than the itch screenshot.