By centralisation I don't necessarily mean of the models. It might be the training, training your own model requires expensive hardware (even just a high end graphics card is out of reach for most of the world).

But also, a model running on your phone generating AI content is likely to be cheaper and not as good as human curated content in whatever form that is.

I think compute can be decentralised, while the power is still centralised, or at least those at the low end lose out on quality.