It’s sustainable at $1/month at current costs, but those costs will go up over time. The subscription price could be raised accordingly but they can’t go back and ask for an inflation adjustment from people who bought it.
replyTechnically you could invest the money that hasn’t been used to cover the lifetime user’s costs.
replyEven leaving it in a the right checking account, it’ll earn interest.
But that's a gamble! That's exactly my point. Someone is betting on something. How long the customer will stay, how long the software will be maintained and available, etc.
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