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F-Droid build servers can't build modern Android apps due to outdated CPUs
(news.ycombinator.com)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
IzzyOnDroid is an F-Droid style repository for Android apps, provided by IzzyOnDroid. Applications in this repository are official binaries built by the original application developers, taken from their resp. repositories (mostly Github).
I'm not too worried, as one user said they have the money to upgrade the servers.