She was provoking Vikas all the time. That might be irritating, but it's not against the rules.
She threatened that she would reveal his family's secret on national television. I'm not sure if this is against the rules or not, because Bigg Boss and Salman bash contestants for this based on their convenience and favoritism.
But threatening to bring outside matters inside the house is previously done by Jasmin, Kavita and Nikki. They didn't face repurcussions or bashing from Salman for that.
She was touching Vikas without his permission. Even after getting warning from Bigg Boss she didn't mend her ways.
That is harassment and also against the rules. But this is something done by contestants all the time when they get into heated arguments and fights. Bigg Boss never punishes them for that.
So just because Vikas got evicted for throwing Arshi in the pool, and people could relate to him as no one could've tolerated her if in his place, Arshi should face punishment?
Does Arshi really deserve any punishment for her any acts? Did she really crossed limits which no contestant previously did?
If Arshi gets punishment or faces eviction for this, then it would only be a revenge for what she did with Vikas and to serve some sort of justice, which won't really be a justice in the eyes of everyone.