We have already seen that users can become emotionally attached to chat bots. Now imagine if the ToS is "do whatever you want".
Automated cat fishing, fully automated girlfriend scams. How about online chat rooms for gambling where half the "users" chatting are actually AI bots slowly convincing people to spend even more money? Take any online mobile game that is clan based, now some of the clan members are actually chatbots encouraging the humans to spend more money to "keep up".
LLMs absolutely need some restrictions on their use.