Some posters are speculating on the Finnair forum that AY can see the fare details of a DONEx fare because it is a JV partner with AA/BA/IB. Therefore, AY+ could award points based on spend rather than distance.
https://www.flyertalk.com/forum/37676375-post662.html

For those who are using AY+, what have you received for an AY operated flight. but marketed by another OW airline e.g. AAxxxx on a HEL-USA? Is it spend or mileage? I believe that an AY marketed flight, but not operated by AY earn based on spend.