Not at all, its like steam. F-droid and GOG can provide software but neither can truly replicate the functionality or the full library of software. F-Droid doesnt have a g-pay alternative because its an open source hobby project and they dont have extensive cloud services.
Well F-Droid is popular and you can just download apks, thats what epic games did (simply distributing their store as an apk)
Can either of those compete with Google Play on equal terms though?
Not at all, its like steam. F-droid and GOG can provide software but neither can truly replicate the functionality or the full library of software. F-Droid doesnt have a g-pay alternative because its an open source hobby project and they dont have extensive cloud services.