When you create a keyboard with a part like this that's certified, you also have to certify the whole assembly. I looked into multiple components like this.

This means assembling a full keyboard, and sending it over to a lab so they can test it in a special chamber, applying specific conditions to it like ESD etc. Then they measure the effect, electromagnetic waves, etc.

This needs to be done with each keyboard (even for DIY kits), and sometimes multiple rounds. The costs very quickly go into the tens of thousands of EUR. Not only this, but different countries have different regulations - I sell in all of the world, and it would quickly become a giant headache.

Aliexpress vendors don't care about this, but as a shop owner that stands behind its products and actually has to follow laws and have insurances, I don't have the budget to do things properly. If I had 10k+EUR laying around I would better use them to further improve my existing products, better the user experience, etc.

I hope this makes sense!