Personalized conversations: how AI adapts to your preferences

I've recently started using several AI platforms for communication, and what surprised me is how quickly they adjust to my preferences. For example, I always prefer a more casual style of communication, and one day while talking to a bot, I noticed that the responses became much easier and funnier. It's as if the AI “caught on” to my communication style and started responding in a similar manner. But I wonder - doesn't some depth get lost in this? How natural is that?