If you have an Android phone, you'll have access to millions of apps on the Google Play Store. While many of these apps are legitimate, some are fake, and might even install malware on your device.
You can install apps, even if Play Protect hard blocks them.
I don’t have a problem using ADB via the command line every now and again. But between remembering where I put the executable, opening a terminal window, connecting a device, and pasting in the APK ...