We have to fight censorship, not introduce a new attack vector that will result in a whole new class of scams targeted at hundreds of millions of people.
Tumblr, Twitter, TikTok - ok, let's focus on preserving access to these apps if you feel this is important. Allowing users to install any unverified app is a massive problem. Just look at what we use our phones for: banking, health, investment, personal info, 2FA, and more.
F-droid is safer (reproducible builds of open source software) than the Play Store (static analysis followed by dynamic analysis in a cloud emulator), which is safer than the Apple App Store (human looking at a HIG checklist).
To be clear, F-droid is an excellent piece of software. It's small and is used mostly by quite technical people, so it's not as an attractive target as Apple's AppStore. But that's the thing: some technical solutions work amazingly well for the 0.001% (like HN users). But they do not scale to tech illiterate people. It's a completely different problem space.
Tumblr, Twitter, TikTok - ok, let's focus on preserving access to these apps if you feel this is important. Allowing users to install any unverified app is a massive problem. Just look at what we use our phones for: banking, health, investment, personal info, 2FA, and more.