So it won't be possible to make payment only 1 time? As I read, we'll have to pay monthly to use yur MoonTrader
Discounted 1-year subscription should be for sure, but no more 1 payment.
This project has current features list and requests list equal to 5 years of updates of regular products(or several years of MoonBot-like updates, check Moonbot versions history (more than 200 updates through 2018)). Sustaining such constant year-to-year development mode requires a subscription-based billing model.