There have been, but most non-technical users don't care or don't go through the hassle of using them.

Is there any that I should be looking into?

F-droid is the biggest one

Check out droidify or neo store for a better front end to f-droid

	▲	nosioptar 7 hours ago \| parent [-]
		I use Foxy Droid. It's unfortunate the official f-droid client is an unusable mess. (I stopped using it years ago, maybe they fixed it.) There's also f-droid classic, can't remember why I use foxy droid over it.

The Huawei AppGallery is hundreds of times bigger.