I'd hardly call F-Droid dangerous, these apps are generally safer than many apps on Google's Play Store. Sure, if you get some apk files from some shady website for the purpose of piracy, you are likely to get malware, but stop acting like installing apps outside of the default appstore is some dangerous and irresponsible thing. Your phone is a computer that lives in your pocket, treat it like you would treat a PC and you'll be fine.

Open Source apps tend to be more secure because you can see, change and audit the code.

There were too many hacking Attacks for normal apps that contain mostly adware or Malware for both brands... As many are greedy and need to have some purpose to pay 100€ for just showing up on the store.

With sideloading Open Source apps, you can enjoy a life many people call as the only free life you can have. Richard Stallman makes nearly a religion out of it with GNU.

Tell me you don't understand technology without saying you don't understand technology.

You are just perpetuating Apple's excuses to keep charging you.

Also: https://www.wired.com/story/apple-app-store-malware-click-fraud/