The draw is Provably fair and in no way different to any other draw that are done all over the world for anything else. (People risking more money buying more tickets... increase their chances for success) Unfortunately draws like this, gives people with more money a higher probability for a win, but they also risk more money in buying more tickets.
So, let's look at this from the other side... A rich guy might spend $20 000 on tickets for the same same Lambo prize as the person who bought $20 worth of tickets. (Will it then be unfair if the person who risked only $20 ....won the prize?)
Fair and luck are two different things I guess;) Fair is mathematics here, not fair in terms of karma or effort or spend! I mean, life is fair also in that sense, it gives you mathematical chances to get things, but you are never guaranteed them, you just have better chances at jobs and happiness, if you do more, you get more chances.
Except if you have friends in high places, then the whole system becomes provably rigged;)