i suspect that TSMC doesn't have as big a monopoly as you've made it out to be, not because intel is competing, but because the customers of TSMC are large enough that they "force" the innovation (aka, they "threaten" to not use them if they stop innovating).
Also, TSMC hasn't been around long enough to become the slow behemoths that other big monopolies have become.
Also, TSMC hasn't been around long enough to become the slow behemoths that other big monopolies have become.