Because he’s CLEARLY balding and whatever products or procedures he’s using to cover it up is not working… Pictured below are before and after photos of LeBron in 2017 when it was very clear he was balding. I don’t know what he did/used (rogaine, transplant, hair fibers, etc…) to restore his hairline, but it came back and everyone took notice.
I’m not exactly sure what’s happening to LeBron’s hair, but his headband looks to be the cause of his ruined hairline here. What you’ll also notice after the Jazz game, LeBron has not worn a headband on the court since.