Yes it is a great way of promotion and introduction to start in this forum, at least see the response of this forum community how to test game on this site with free money, but I don't see any sign below that there is free $5 from OP for new users, but is it just bonus money and cannot be withdrawn at the end if used and win in the game.
This is a free $5, no strings attached - if you choose to withdraw it immediately then that works as well, I'll consider it you testing our withdrawals. Ideally you use it to play around on the site and see how everything works, but that's up to you!
We plan on running plenty more promotions for Bitcointalk specifically, be on the lookout for those