If you had a machine that created a window through which you could see the future, and in the future you wrote down the winning lottery numbers and relayed that information to your present self before that lottery number was drawn.
However, in your present selfs excitement, you turn off the machine before your future self wrote the winning lottery numbers into it for your past self.
What would happen?
It’s called a looped timeline pair. Timeline 1 creates timeline 2, and timeline 2 creates timeline 1. Both timelines exist on an alternating basis. It’s one of the results of the bootstrap paradox. When people think of the bootstrap paradox, they usually think of single looped timelines. Those appear in media all the time. Harry Potter, Gargoyles, etc. But an unstable set of timelines can also stabilise across two, three, or more timelines instead of just one.
Out of the infinite versions of you in the multiverse, half win the lottery and half don’t. Which one your consciousness inhabits is pure luck.