Illinois are stupid. You have to request a ballot, but you just go online and enter your name and address, if there’s a registered voter by that name, you just enter the new address you want your ballot sent to.
Missouri sounds a bit excessive, but there’s no check at all for Illinois that it’s the same person actually requesting the ballot. Voter register info is public I believe, any troll could request anyone’s ballot and send it god knows where in the US and thus block that person from mailing in a real
ballot.