@adi@twtxt.net I think it is, and one benefit they have is that you can add third-party repositories to the F-Droid app as you discover them. So, for instance, if you know of a developer who pushes builds to an F-Droid compatible repository, you can add that to your F-Droid app and start tracking updates like you would for any other app in there. Can’t do that with Google Play!
F-Droid tends to focus on open source applications that can be built in a reproducible way, which limits the inventory (though of course tends to mean the apps are safer and don’t spy on you). There are non-free apps in there as well but they come with warnings so you’re informed about what you might be sacrificing by using them.
That said if you have a favorite app you get through Google Play, there’s a decent chance it won’t be in F-Droid. Many “big corporate” apps aren’t, and vendor-specific apps tend not to be either. But for most of the major functions you might want, like email clients, calendar apps, weather apps, etc etc, there are very good substitutes now in F-Droid. You’re definitely making a trade-off though.
What I did was go through the apps I had installed on my last phone, found as many substitutes in F-Droid as I could, started using those instead to see how they worked, and bit by bit replaced as much as I could from Google Play with a comparable app from F-Droid. I still have a few apps (mostly vendor-specific things that don’t have substitutes) that come from Google Play but I’m aiming to be rid of those before I need to replace this phone.