I understand why the developer would like to get a recurring form of revenue, but as a consumer buying a subscription makes no sense at all!
The goods obtained (Linux on MabBookAirX,Y) are very much non-recurring by nature...
The goods obtained (Linux on MabBookAirX,Y) are very much non-recurring by nature...
Even if it is the former, updates & improvements take work. And they seem likely to be necessary here.