This forum is not specifically against giveaway threads, but rather the use of it to constantly bump your ANN thread by paying them to post, you can however create a system off the forum such as a Google sheet for applications and link it to a thread where you announce the giveaway, so users from here would go there and apply and do not need to apply through replies;
Specifically, you are not allowed to give people any incentive to post insubstantial posts in your threads. You can't offer to pay people who post their addresses, usernames, etc. You can do giveaways off-site and link to the giveaway page in a thread, but you can't give people any bonus for replying to your thread.