depends what you call a "big deposit"
it won't be as big as infinity's but a deposit will be required.
these books, nowadays, want to reward their players (real players) when they put up big promotions like this.
if someone is a real player and they're going to make a deposit somewhere anyway, this is a shot to win some extra cash.
in the old days all the contests were free but, after awhile, they didn't get ANY business from the promotions. there are several hundred, maybe several thousand, people that only play free contests and have never made a deposit into an offshore sportsbook.
the free contests are going to be a thing of the past.
good luck if you get in