ChatGPT is very cool but they don't make money from it and GPT-3 had a paid public API for a year now and I read that the money they make from it is very little, insignificant compared to the funding they get from VCs.
Currently, there's no clear path for monetisation but has the capacity to take away a lot of Google's use cases. In essence, it's like Napster destroying the Music CD business.
Maybe it's also a bit like Kodak: Invents the technology but its current business is too good to be messed around with. This new tech is the future but we are happy in the moment.