Do you have a static IP address? CG-NAT has done a really great job of hindering torrents, since my understanding is that at least one side of the connection needs to have an open port. So, if you don’t, then only the few people who do are able to download from you, which can make it seem like no one wants your stuff.

Why would you need to block apps installing from non-Play Store sources? You shouldn’t be plugging your phone into mysterious USB ports, and the OS should always prompt you before installing a local .apk file. If you’re savvy enough to use F-Droid, you’re savvy enough to not need that hand-holding “safety” feature.