If the app store took a 3% chunk and never refunded it regardless of the ongoing status of the transaction, that would put them right in line with other payment processors. It would also still net them billions of dollars, I think!
So basically a license is public info, the app enforces that the logged in user must match the user in the license.
On a practical level, no foreign government is going to bother you until your sales are in the millions, at least. They don’t have the ability to know your sales in the first place, and you’re way too small to bother trying to go after. Especially since there’s no real enforcement mechanism for, say, France to try and collect $200 from some random American online software business.
Philosophically, I vehemently disagree with the premise that a foreign jurisdiction can tax my business because their citizens choose to visit my website and buy things. Should German websites pay a 200% tax if citizens of Eritrea buy things from their website, just because Eritrea passes a law that says that? I have zero representation or connection to these jurisdictions, and if they want tax money or to stop their citizens from using my website, that’s between the citizens and their government. Until there’s some enforcement mechanism, I’ll just keep ignoring them like I always have.
And sure enough Mac users account for 30% for the revenue today.
Another advantage is that it runs completely on the user's computer. So I have no database or back-end to maintain. There is only a small server to generate licenses + handle some analytics the app emits both built on ASP.NET. The only data I store is in a Microsoft Azure table. I pay around $2 a month for all azure costs.
I was wondering about any resources you have to learn about licensing and legal stuff, or any common caveats that you ran into.
Second will be dealing with sales tax and it's a nightmare. If you sell to customers in Europe you need to pay VAT to different countries at different rates. Same goes for US states that tax very differently. We moved recently to paddle.com which acts as a reseller and so they take care of all sales tax collection and remittance (they are the one selling the app after all). We moved away from PayPal and so far it's been very smooth.
I worked on a paid tier (learnt a tremendous amount about actually selling an app, integration with payment processors, licensing, more legal stuff than I wanted to etc.)
Almost from the get go, it started making +$3k/mo. With more changes and offering a Mac version along a Windows version, it averages around +$7k/mo of revenue consistently. I'm the only person on it and have a full time job. Barely need to make code changes and it requires minimal effort for customer support.