"The big default app stores are full of millions of crap apps trying to monetize you, and F-droid only has a few thousand high-quality open source apps created to actually benefit you" might be a little less roundabout, if not too on the nose.
The censorship angle makes sense regarding app devs who complain about getting their app removed for unknown "policy violations", and the fact that a would-be malware dev would (hopefully) hesitate before publishing on an open-source repo is a positive type of curation/censorship.
The censorship angle makes sense regarding app devs who complain about getting their app removed for unknown "policy violations", and the fact that a would-be malware dev would (hopefully) hesitate before publishing on an open-source repo is a positive type of curation/censorship.