Oddsmaker sucks!
Make sure you read the complete Terms of Service before taking this free offer. You will find that all sorts of wagers are violations. Like teasers for example.
I got the same offer a year ago for a free $200. Signed up and only read the brief description on roll over requirement and payout. In my first group of bets was a $20 teaser. The next day, I read the full TOS and saw that teasers were not allowed, nor were a bunch of other bets and casino wagers.
I e-mailed support asking if I could continue with the promotion by forfeiting the $20 for the teaser. I wanted a yes or no in writing before continuing. My inquiries(6 of them) , were completely ignored.
I imagine they just want to suck people in hoping the chase will lead to a real money deposit, while making the "rules" murky enough to pretty much find any way not to pay the occasional luckbox.
Go ahead. Take a shot at them with their own money. Just read the fine print, and never send them a dime of yours.
Good Luck.