Apple iPhone 15 battery can retain 80% of capacity after 1000 charge cycles
9to5mac.com
9to5mac.com
500 is actually average for many years now, Premium smartphones used to introduce batteries with a cycle-life of 800 already ~10 years ago [1], using more expensive batteries...
(However, I'm not sure if they rolled back to 500 on newer products then and stopped talking about it, considering that apparently noone cared...)
[1] https://www.stuff.tv/news/lg-optimus-g-officially-announced
Anyway, the first product I'm aware of supporting a battery cycle-life of 800 was the LG Optimus G in 2012, with a battery from LG Chem