Most warranties in the US are only "free from manufacturing defects" so if the gear was manufactured to spec, but just wore out, then it's not covered

Also a 90 day warranty is not uncommon

There’s a problem.

In Australia a 12 month warranty is required. And for “expensive goods” it’s 24 months.

I’m not sure where the line is, but an iPhone certainly falls into the expensive category.

When those battery woes occurred, Apple was required to replace batteries, and they did.

It varies from state-to-state, but "Caveat Emptor" is the general rule of the land in the US.

[edit]

It's not quite "Caveat Emptor" but rather "perfect-tender" which still requires the buyer to inspect the items with "reasonable promptness"