I wrote above that it is very easy to do so that a fake ID User wins the lottery. You just manually wind up 1 billion tickets for him, for example, or a 99,9% chance of winning. No one can determine this, you need to be the administrator of this site.
They can add fake tickets to the pool, but the more tickets they add to the pool, the bigger the prize pool will become.
Let's say there are 10 million real tickets and they add 10 million fake tickets to the pool. The lottery is done and there are 5 real winners and 5 fake winners. Now, they pay to 5 people instead of 10, but those 5 winners are paid twice their real prize due to bigger prize pool.