Alkaline batteries are great for remotes and stuff like that, where they potentially last years, in those applications it seems very reasonable, my TV remote still has the included AA batts and I bought it 3 years ago. But they end up getting used in higher drain devices and it gets a bit absurd. Still, at least people aren’t rocking around with their boombox with 6 D cells that last 8hours.
There is in most countries. Unless you mean shortfills you are meant to add nic to? In the US those still firmly fall under the laws restricting sale of vapes. Don’t know about the UK or Europe, I know those products exist there though.
Otherwise you can’t legally sell bulk nicotine to underage people, obviously the other ingredients are used for such a wide variety of things they can’t really be restricted like that.