I recently decided to publish a paid-but-open-source application for getting data off of Android devices and into S3 buckets.
Unfortunately, Google have added so many restrictions and requirements to the awful Play Store that it's essentially impossible for new individuals to publish to the store. The ecosystem is so deliberately dysfunctional that there are now commercial companies set up who will fight through the insanity for developers for a fee.
I'm not doing any of that. I decided instead to publish the application on F-Droid and provide a Liberapay link should anyone wish to throw some coins at me.
Unfortunately, I've had reports that the donations don't actually work. Liberapay's Stripe integration repeatedly failed with an error, and Liberapay and Stripe's support channels each blamed each other. I did successfully set up the PayPal integration, which is to say that Liberapay claims the integration is correctly set up. Unfortunately, anyone trying to donate via PayPal will (after the payment sits in the pending state for several weeks) have their donation returned claiming that I (the receiver) don't have a PayPal account. I even received an email, from PayPal, via my PayPal account, telling me that I don't have a PayPal account.
I'll be looking at alternatives in the new year.