Pexel licensing is very clear

Pexel licensing is very clear to me and now everyone is aware of it.
Under the topic License as seen here https://www.pexels.com/license/

Don’t redistribute or sell the photos and videos on other stock photo or wallpaper platforms.

That is very clear.

Are you wanting to report specific breaches of Pexel wallpapers being redistributed on Pling.com? If so there is a Report Misuse link on every item that can be used.