What percentage of your traffic is mobile? Should crypto products be mobile first?

I've noticed that a lot of ethereum-related websites, especially in the NFT space, have terrible UX on mobile. Sometimes it isn't even possible to use their websites on mobile.

I'm wondering if anyone who works on products in this space might have some insight for me on the traffic breakdown. Are companies building for web first because they have more web than mobile visitors, or is it simply them being scrappy and focusing more on building a product than on building a mobile-friendly product?