I don't think that prohibiting forum based giveaways is a good idea. The giveaways are in bitcoins, so this still have his place. Removing the activity points from this section might finally be a good idea. I went there, and what I saw is panicking.
Investor-based games is not one single bit better.
Nowadays, alomst every ponzi tries to attract investors with some kind of giveaways.
In those threads that don't have active giveaways running, you still see 5-10 people posting their addresses, begging for a tip to test the "program".