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Google removed Organic Maps from the Play Store
(fosstodon.org)
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community
https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
That's old info. Apps are now signed by the developers on F-Droid since about a year ago:
Source: https://f-droid.org/2023/09/03/reproducible-builds-signing-keys-and-binary-repos.html
EDIT: I should note this doesn't address the other issues in your second link (I have twitter blocked, can't see that link) but it does fix the primary issue of the apps originally not being signed by the developer.