Indeed, that's how you play the game, slow and steady and eventually take over the whole store.Because of supply - demand.
The technologies of Samsung, Hynix, Qualcomm and the US companies (Nvidia, Intel, Apple) are all part of a huge network or ecosystem.
Demand for NVIDIA GPU leads to demand for Intel and AMD processors and Samsung Storage which also creates demand for Windows or vice versa. Thereby TSMC get to operate the fabs.
Suppose we just go with SMIC and kick the rest out - What is SMIC going to produce? Can it meet the demand of Consumer computing devices? Where's the ecosystem? What Architecture? Which OS? Who supplies the memory? Who supplies the GPU?
The one shot glory/hell bent measures that DJT did were all self destructive.
This thing is won one costumer at a time, margin by margin.