if coins are craftable it will make it a cool mod that i will use in future server that i will make

Do the coins act like netherite? If not, a rich person could just burn all the coins without admins knowing.

Also, I am creating a data pack for this reason, its called H2GCR (Hard 2 Get Currency). you can read more about it at here.

not sure why anyone would burn their coins, but just not spending them would have a similar effect

In case they are corrupt and like just stole some money off someone to get revenge.

edit
That would have the same effect

and make an option in config to desactivate this for pepole who dont want it craftable

Works as intended, feel free to create a datapack to add recipes. Coins are intentionally not craftable by default because each server admin will have a different way they want to run their economy.