HotHardware news (which this NEws is based on):Electronic Arts reportedly banned Linux players from "Battlefield V" for cheating...even though they weren't.
EA Reportedly Bans Linux Players From Battlefield V for 'Cheating' : Read more
That's also not why they are being banned,the article says that they are using DXVK which "is a set of replacement dll files that translate from DirectX 11 to Vulkan. "Using an unsupported OS and related software isn't cheating. This is likely a situation where the gamers are more tech savvy than the developers. EA/DICE just wants to take the cheap and easy route by deciding an unfamiliar system not controlled by Microsoft is too scary.