I understand your desire for closed source to maintain control of your revenue stream, but I believe that you’ll find most Fediverse folks adverse to closed source. Many associate closed source models with a lack of transparency and a loss of control. A small tool like yours might not run up against that kind of opposition simply because it is small and does not handle a lot of data.

I do like the pay what you want model. It’s helped fund support for open source projects in the past so there shouldn’t be much pushback for that.

It will become harder and harder to stay on Win 10. At some point, he’ll hasn’t to upgrade: either to Linux or to Win 11. All the same, it will come easiest if it’s more or less his idea.