Your answer is why I asked the question.
Not being a member of the SoG so do they expect non-members to volunteer their time, effort, their own computer and to pay for the use of the electricity required to power the computer and local lighting, to spend hours and hours creating the trees and at the end of the day get nothing out of all the work?
Well.... I don't know whether SoG has extended the transcription request beyond members. If they have then there might be a
quid pro quo, but again I don't know. Best way to find out is to ask, given the email address I've hinted at.
The transcription I'm doing and have done for SoG has - so far - not yielded anything for my research, and nor will the transcription I'm doing for another organisation. But I'm happy to do it in spare time as a contribution to the greater good. How other people see volunteer transcription is of course up to them.