AFAIK, the only companies able to produce modern chips are Intel, TSMC, Samsung and GlobalFoundries; and Intel only makes chips for very select third parties, such as Altera, which they did ultimately buy.
Good thing chip producing and chill design is splitting.
It's a bit like how separating railway infrastructure owner and railway operator is good for having more competition among the operators. If you need to build a whole network to run a few trains (compared to renting it on existing infrastructure), then that's a pretty big moat.
AFAIK, the only companies able to produce modern chips are Intel, TSMC, Samsung and GlobalFoundries; and Intel only makes chips for very select third parties, such as Altera, which they did ultimately buy.