ASML's secret sauce is not that secret or uncopyable. The Chinese are already working on their clone of the Twinscan tools.

Veritasium recently made a good video on the ASML machine design: https://youtu.be/MiUHjLxm3V0

The outcome may seem like magic, but the input is "simply" hard work and a big budget: billions of dollars and years of investment into tuning the parameters like droplet size, frequency, etc...

The interviews make it clear that the real reason ASML's machines are (currently) unique is that few people had the vision, patience, and money to fund what seemed at the time impossible. The real magic was that ASML managed to hang on by a fingernail and get a successful result before the money ran out.

Now that tin droplet EUV lasers have not only been demonstrated to be possible, but have become the essential component of a hugely profitable AI chip manufacturing industry, obtaining funding to develop a clone will be much easier.

> ASML's secret sauce is not that secret or uncopyable.

You must've watched a different video. They took a decade to get there and they're happy to show all the how-to's because they know the devil is in the details.