These kind of coordinated efforts come from think tanks, lobbyist groups, etc. If you look around you'll see a lot of nearly-identical bills introduced in several states more or less simultaneously, not just about this topic but about all sorts of things.
I don't think there's any requirement anywhere that legislators write their own bills. But they do have a lot of incentive to introduce bills on behalf of their larger campaign donors.
I don't think there's any requirement anywhere that legislators write their own bills. But they do have a lot of incentive to introduce bills on behalf of their larger campaign donors.