The illustrated breakage doesn’t show specific signs of impact damage (this usually evidenced by radiating cracks from an impact point), or a single hairline crack that might indicate a rare manufacturing defect of the screen cover glass.
Is at all possible that someone, or something (such as a pet) may have either sat-upon or been placed on the iPad - even while protected by its case? A remaining possibility is swelling of the iPad’s battery during charging (i.e., a battery fault/defect), the swelling battery applying pressure to the screen from within the iPad.
It is notoriously difficult to prove that a cracks or a shattered screen are the result of a manufacturing or material defect. As such, screen damage is often excluded from warranty claims.
Apple offer a limited one-year warranty - against which you might attempt to make a claim. If making a warranty claim, your should first attempt to make a claim with your retailer - as it is most often the retailer with whom your purchase contract (and therefore your warranty) principally exists. If unsuccessful, you then have the potential backup of making a claim against the manufacturer’s limited warranty.
If you had the foresight of opting to purchase Apple’s AppleCare+ plan, this being an insurance product, you will have the security of being able to make claim with Apple regardless of fault. In such circumstances, a small excess/deductible charge is made - and you will receive a replacement (usually a reconditioned iPad of the same model and specification) iPad.
Accidents happen; consider that your domestic/home insurance policy may provide cover for accidental damage. If so, the insurance excess/deductible may be considerably less that the cost of repair/replacement.
