Oneplus offers lifetime free display replacements, but only in India. Samsung was also offering selective display replacements for select S series device for a limited time time again only in India…
Personally, all companies should provide display replacements for hardware defects at least upto 5 if not 6 years. If I get a greenline on my smartphone I won’t be buying from them again.
You already need to be mindful of displaying static elements on OLED displays. Greenline is another problem.