What if the ToS change is to curb abuse? Can users just opt-out and continue their abuse? What if the abuse is costing Twitter significant money? I see languag

What if the ToS change is to curb abuse? Can users just opt-out and continue their abuse? What if the abuse is costing Twitter significant money? I see language about decompiling. Do they have to continue providing service to companies who may be exploiting loopholes in the ToS?