There is a health app that is very important to sufferers of a specific disease and it is freemium and I find this detestable. I am doing a clean room rewrite of it in its entirety and plan to release it on fdroid. Is there a license that prevents some ghoul from forking it to profit from people’s misfortunes? I am trying to avoid legal issues by being clean room but will try to keep my publishing of the app as anonymous as possible regardless. Thanks
Look into Creative Commons Non-Commercial/Share-Alike licenses: https://creativecommons.org/share-your-work/use-remix/cc-licenses/#by-nc-sa
Which, just to be clear for OP, ist not Open Source anymore.