Thank you for your post! Sorry for a delay in reply I've been on holiday the past week.
I have been thinking more about how to increase revenue from beorg. Currently most of my income is from freelance development work - and beorg revenue at the moment is only equivalent to 1 days freelancing per month. I would love to be able to spend more more time than I do on beorg and really accelerate development. Eventually I want to find a way to make beorg Free Software - however this isn't an easy proposition for an indie developer who needs to generate a decent income from my time spent during the working day. My dream is to get enough users on board who are not necessarily current Emacs and Org mode users - but users who just want a decent task management app for iOS and see the benefits of plain text. At that point making beorg available under a free software/Open Source license could then become a reality as I would have sufficient time to both manage it as an open source project and as a business.
beorg 3 is going to be released next month and will introduce subscription pricing. For users who don't want to subscribe I will continue to offer the ability to unlock individual extensions with a one-off in-app purchase. Alongside this is a new clocking/task timers extensions and I hope that beorg will then become attractive to a whole new group of users who will see the benefits of plain text time tracking.
Asking for contributions for a specific app outside of the App Store can be problematic (although not impossible) as Apple like to make sure they take their cut. So ideally I want to stick with the current in-app purchase model, however may review this in the future.