Yeah, we use them here in Lithuania - but I have never seen them used for private contracts.

I'm not even sure how i can use my signature outside the AWFUL experience that is the government esig portal.

I dont think they are accessible for non-resident entities either - i.e. i can only get lithuanian signatures through the lithuanian portal.

This likely explains why they arent used b2b as you would need a separate contract process for foreign and domestic.