Buy real fruit and a juicer and make juice. Or buy frozen concentrates and make juice (concentrates are just condensed juice frozen for longevity). Or just eat fruit. So many options that arent sugar water.

But for real, the reason things like this exist, apart from being cheaper to produce, is that shelf stable juices that dont lose all flavor over time is sometimes basically impossible. And fresher juices that arent shelf stable either will be heavily seasonal or need to be green house grown for off season which is rarely worth the overhead.

Slight tangent and fun fact, the old joke “why is lemonade made with artificial flavoring but floor cleaner is made with real lemons?” Actually has a legit answer. Check a not-from-concentrate bottle of orange juice at the grocery and you should see that it contains artificial flavors, even though it also contains real juice. There is a reason for that. Citrus juices can be preserved long term to make the supply of juices available year round. However, the flavor compounds in citrus juices oxidize overtime making it blander and blander. It will be fine to drink, but it will not taste like an orange/lemon/lime/etc. So they have to add that flavor back in with artificial flavorings. And the reason that floor cleaner has real lemon is that its properties that make it clean well are not diminished by long term storage.