https://www.cnet.com/news/all-galaxy-s10-and-10-plus-will-come-with-a-30-screen-protector/

The screen protectors aren't protected by the one-year warranty that apply to the other accessories in the box (the charger, USB connector, etc.) and retail for $29.99 if you want to buy a replacement. Samsung isn't the only company to do this. OnePlus have preinstalled screen protectors on its phones, like the OnePlus 6T, for years. 

Preorders for the Galaxy S10 started Thursday, Feb. 21. Orders ship out on March 8, the same day retail and carrier availability begins.