If lucky enough to get that bonus and you're able to win with $100 then you should comply with their rules if you want to get that bonus. Such a wagering requirement is really needed for them to at least distribute you what you've won.
Sometimes it worth to give a shot casino bonuses for fun and trying your luck but it is bad decision in the long run for mentioned reasons. Let's say you made $10k out of $30 bonus but you are supposed to wager x50 and verify account before withdrawal in most cases.
But if it's worth it for the buck and you have no choice then that's it. It's true about the possible of leaking of information, from email to the important documents.