Don't be surprised that you will not get anything at the end of the day even if you deposited the $700. Moreover I think you should look that the terms and conditions very well before deciding to go ahead with that. Sometimes they will require you to do some sort of futures trading to qualify for the offer. What if you don't have the knowledge about futures trading? Don't allow your greed to land you into perpetual loss. You won't get anything for depositing the money just have that in mind. Even if they give you something, they will tell you, it can only be used to pay for exchange fees when you are doing futures trading.
I've always known that there's no freebies online, if it's not a scam there's always a clause somewhere that is not highlighted, it's after you meet the requirement that you'll be directed to further tasks that you didn't know that existed. I have had a few experiences that is why I'm very skeptical about bonuses and giveaways, I don't get carried away anymore. Crypto.com most probably want to increase their customer base, hence the challange, in the end I doubt that 1 BTC will be shared to every winner, perhaps some bonuses to a small percentage of perticipants that went the extra mile to satisfy their requirements, this is just my thoughts. Perticipants that wants to deposit the $700 should read between the lines of the TOS so that they won't miss any hidden details..