You know ultimately we all lose if we charge once because it leaves us endlessly needing new customers to pay for our biggest fans checking in daily to see if there’s new puzzles.
Beyond just being free there’s far more that could be done in that vein but the hard part is finding a way where any of it is possible without gliding into bankruptcy. There’s a thing in software development called open source which is a way of licensing your code such that anyone can get a copy of it.
In a perfect world the jigsaw source code would be readily available to anyone for learning or improving or making their own apps or making it work on other platforms, devices, languages etc. Also our companion software we wrote for managing and publishing puzzles. At that point we could do some really cute stuff like having the option to add 3rd-party feeds to download puzzles from within the same app.
Unfortunately we’re a long way from that being viable just now.