TSMC is how they stay competitive; that’s what everyone else uses

Intel is still catching up with 18A

The 18A production node itself is designed to prove that Intel can not only create a compelling CPU architecture but also manufacture it internally on a technology node competitive with TSMC's best offerings.

https://www.tomshardware.com/pc-components/cpus/intels-18a-production-starts-before-tsmcs-competing-n2-tech-heres-how-the-two-process-nodes-compare