I’m sort of lost

Ok so i’m sort of confused on why Farrah was fired. Was it bc of her being abusive to the crew or bc she started doing OnlyFans? If it's the latter wouldn't that be kind of hypocritical of MTV to fire her but allow Cate/Tyler to continue to be on the show despite Tyler having an OF? I do not subscribe to either Farrah/Ty’s OF so I have absolutely no clue as to what they port. I’m just genuinely confused as to why she was fired.