The data is no where near valuable enough without a new high value surface to use it, and so far chat is not it.
Merely selling data is extremely low value compared to also having the surface monopoly to monetize it in a very high engagement and decisioning space.
I feel like you don’t understand the fundamental mechanics of the ad world. Ultimately, the big 4 own such immense decisions surface area it may be a while before any AI model company can create a product the get there.