I'd think offering an additional bonus to post in the ANN thread would fall into the category of an ICO bumping
scheme, which is close enough to an ICO bumping
service and is equally as shady and untrustworthy when you are at a forum where bumping more than once every 24 hours is not allowed. Incentivizing or paying someone to bump your thread is not something that has been allowed in the past and I doubt will be allowed in the future.
Most giveaway threads are no longer allowed in the Alternate cryptocurrencies sections. From now on, posting or replying to such threads could result in being banned. Existing threads will be locked.
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.
Similar threads are already restricted to Games and Rounds in the non-altcoin sections, but the giveaway-related post volume is so high in the altcoin sections that I've decided to just ban them entirely here.