I've already done some research and from what I understand, in the fining phase agents such as fish bladders or egg whites are used to group together the debris in the wine. This makes filtering them out easier. So in theory the fining agents should get removed in the filtration process too. But some may get missed. So a wine that advertises itself as vegan or vegetarian used an alternative to fining agent? Do some vegan wines simply skip the fining phase, or do all wines go through fining?
Is it more of a marketing thing to call a wine vegan since realistically most already are?