Warranty only goes for 1-3 years. Where the rate of failure for batteries is very low. After that, you're stuck with high repair costs or buying a new device that falls under warranty again. It's a racket and people keep falling for it.
>But Apple has to replace the batteries and pay for it under their warranties, not you.
Apple operate the 1 year MacBook warranty policy across the world with only specific countries that they abide by the law of 3 years warranty. However if you dont mention it, as in UK, they will still charge you for it.
Maybe it's different in some parts of the world, but at least in the US, the scenario described by the parent will not be covered by the warranty, and you will have to pay for it:
> It's $200 for a 2015 MacBook Pro for Apple to replace the battery.
Batteries won't wear out in a year, and battery wear from normal use is not always covered by warranty. You're going to be paying for it in 90% of cases.