If the companies making those agents are paying top dollar for training data then the product isn't going to be truly free, at best it will be "free" with caveats. Do you want to use an AI agent which is fine-tuned according to the wishes of the top bidding advertisers? Because that's probably the first thing they'll try to make "free" chatbots actually turn a profit.
The future is having your own personal AI assistant, completely free of charge, which is suspiciously eager to recommend shopping at Temu and eating at McDonalds.