If normal lottery ticket buyers knew this sort of thing was going on, they'd likely stop buying tickets.
This is the literal answer to "why." Also bans on various casino hacks.
If the state wants to encourage this kind of large scale game playing, then they should outline the process for taking part in it clearly and ensure everyone has equal access to the tools that enabled it.
Where you are born, what ethnicity you are, how rich your parents are, how healthy, athletic, brainy, beautiful you are, what you eat, how you live, nothing in any part of your life is "fair".
So sure, play the lottery if you like, but don't pretend it's fair. Indeed the unfairness of the winning is entirely the point of it.
Of course if you are playing the lottery and dreaming of a better life, you already know how unfair life really is.
My parents did not teach me that fairness was a virtue. They taught me that "life's not fair". With the unspoken addendum of "deal with it".
I guess I won the lottery in that respect.
it's just that optimum stopped being "zero tickets bought" and instead shifted to "all tickets bought"
Group buys add a social context that has significant value too.