Toger

Much less likely. Humans are bad at picking random numbers and you'll get a bias, the machine is random. Think of how many tickets will be in the range that might line up with someones birthday or other calender-date..

The first ticket is the biggest improvement in your chance to win. Letting the random number generator pick your number reduces the chance you'll have to share it (humans are horrible at picking random numbers; so many are going to be in the birthdate range etc), so don't pick your own numbers.

1/0

It is roughly equivalent to how there is no authentication to the return address you put on a piece of snail-mail. There has been some progress with SPF / DKIM, but the receving server has to support it, the sending server has to support it, and until the vast majority of legit senders support it then receivers have to accept unauthenticated email. Any email receiver who just says 'We only accept authenticated email' is immediately out of business as all their customers leave for a provider that can properly receive email from all their personal and business contacts.

Well there is no regulatory body that can enforce anything against every mail provider across the globe, and each provider is ecomically incentivized to avoid refusing potentially legit emails. It is a mess.