Do they need warranties? Doesn't Amazon have a return anything, anytime policy? I thought I read stories about people just buying stuff, using it, and returning

Do they need warranties? Doesn't Amazon have a return anything, anytime policy? I thought I read stories about people just buying stuff, using it, and returning it years later after it's worn out for a refund or replacement. I think I heard this in one of the many Amazon returns mystery box videos on YouTube.