The Built in screen protector on my Galaxy S20 is starting to peel off and bubbles are visible. I had my phone for less than a year, does it have warranty?
For general "wear and tear", I doubt it's covered ... I would think it's covered if it "fails" within a short amount of time, like 15 - 30 days.
However, that's all a guess - a mod may show up and provide a different answer.