There are none in the sense that all high volume production of high-end chips uses ASML. With the possible exception of what Huawei is doing.
However because the Chinese electronics industry is so big and they rely so much on imports, when they are building alternatives to the US-controlled semiconductor supply chain (ASML, Applied Materials, TSMC etc.), it will matter at one point for ASML even if the Chinese tools and final products are never exported.
Suppose China develops a cheaper way to produce the EUV light and sells the tools for half what ASML does. They might sell to others just to become the leader.
"Anyone planning a major semiconductor fab in the 2020s", then quite probably, yes.
Lest we forget, Japan and South Korea are mulling a free trade agreement[1] with China.
Anyone following US-led sanctions against China are doing so dragging their feet and groaning in annoyance.
[1]: https://en.wikipedia.org/wiki/China%E2%80%93Japan%E2%80%93So...
* You keep your secret sauce secret and take over the world with subsequent products.
* You sell your secret sauce to everyone and take over the world becoming the sole source of secret sauce.
So far, China has had resounding success with the latter.
But if they have something the west doesn't have, why sell it and up an advantage? We aren't friends. There are plenty of things the Chinese aren't selling to the west already (real innovations), and vice versa.
IMO that is the real threat to both ASML and the current Western supply chain. By forcing China out you make it very likely they will choose to leap-frog instead of try play catch-up. They did it with EVs there is a very good chance they do it with semiconductors also.
Which sounds like a terrible idea until you realize they would need all the same stuff for EUV except when they are done they would still be ~10-15 years behind.
Building an entirely new process based on xray would be challenging certainly but not that much more challenging from going from where they are to EUV.
If one goes for particle accelerator based systems with wigglers, then of course none of this will matter, since the wavelength will be variable and one can use whatever wavelength is ideal, but the idea that going to shorter wavelengths is always better is something I think is crazy. There'll be some optimal wavelength.
Seriously, try to design anything non-trivial without a TI part anywhere. Even in China, foreign brands are everywhere in electronics, and much of it is imported.
There's a lot of scope left for China to penetrate the "low end" semiconductor (and other electronic parts) market as well.