Comparing premium brands with Aldi lookalike ones is like comparing apples and pears.
I’ve had this argument with my mother when she says “oh, but Aldi don’t make it themselves”.
The difference is that own labels are usually made by white-label companies, not the premium brand ones.
The own labels are copies, so no development costs, cheaper ingredients and no marketing costs and no risk of product failure, because the own labels only copy the more popular products and the premium brands will also sell the more niche products (eg less popular flavours of crisps).
Whilst the premium brands might take the mick sometimes, without them, the cheaper brands wouldn’t exist in the first place.