It seems like they are banning lots of folk that are doing 4x2 farming while supposedly not doing/using anything inappropriate.

This observation is based upon posts I see in various discords so is anecdotal but it does seem like there is a focus on folk farming Retail that way. Personally I haven't played Retail since BFA launch let alone ShadowLands so I don't really know 4x2 methods/approaches/benefits (and don't care to).