MacBook pro 16-inch (late 2019) display issues (horizontal lines)

Consumer products, their warranties, and their extended warranties work in a predictable way.

Warrant-able implies, but does not guarantee, High Quality:

Consumer product makers build high quality products. You can tell because the manufacturer is willing to stand by their products and repair or replace them (but only for defects in materials or workmanship) at manufacturers expense for a stated warranty period.

For Apple Macs in most countries, that period is one year. That is the total responsibility Apple or any manufacturer has to you under law. Assumptions about additional responsibility of Apple or any other consumer product-maker's products working longer than the warranty period are not accurate. The amount you paid for the product has no bearing on this. The rules are the same for a car costing US$20,000 or more.

Electro-mechanical devices fail at random, arbitrary, and capricious times.

The most frequent reason for most failures is 'just because'.

Your specific failure is most likely caused by an advanced scientific principle called ...

... 'bad luck'.

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If you want a really substantial lesson how this this works (or more precisely how this stops working) own an older used automobile.

Apple has only two boxes to check:

[_] defects in materials or workmanship, possibly covered by warranty

[_] OTHER, including accidental damage

checking OTHER is not an accusation, it simply says yours is not a defect in materials or workmanship.

This is a hardware issue and screen replacement is the only option for as far as I know