They do but they have explicitly given up the game of competing to be the first to the next fastest smallest digital logic (i.e. cutting edge nodes).

Micron is still pushing DRAM and NAND tech but it's more for cost cutting since they are strictly commodities. The work it takes to be a pure-play fab like TSMC is pretty different - lots of working with fabless vendors to bring up their chips. Even Intel isn't any good at this (yet). It's a collaborative process.

> Micron and Texas Instruments have their own foundries as well.

At their tech level there's probably hundreds of companies with fabs[1]. GP was explicitly talking about cutting edge fabs.

[1] https://en.wikipedia.org/wiki/List_of_semiconductor_fabricat...