Yes. I had the same problem with F-Droid. I also used to use the Humble Store app back when they had one, same problem.
A good feature is that the Android OS allows you to whitelist sources of Apps, so once you install a "store" you can grant permission to that store to install apps without completely disabling the OS installer security. That didn't used to be a thing - either the setting was Play Store Only or it wasn't and you could grab APKs from the browser.
A good feature is that the Android OS allows you to whitelist sources of Apps, so once you install a "store" you can grant permission to that store to install apps without completely disabling the OS installer security. That didn't used to be a thing - either the setting was Play Store Only or it wasn't and you could grab APKs from the browser.