actually during several years there were no malicious addons published, so i wouldn't care too much about this.
I agree 100%. Spam in general is currently under control by a) requiring user registration to use the forum, and b) by the moderators deleting the little bit that gets manually posted - kitchen cabinets, anyone?
Like boroda74 I've been on the forum for many years (since 2009) I have not see nor heard of one add-on that was malicious. Some didn't work as expected, but that's not with malicious intent.
Lastly, speaking strictly for myself as a moderator, I have no interest in testing every new add-on, plugin, or skin that gets published.
I truly believe there is no need for an approval system other than what's currently in place. This is a free and open forum. And in a nice departure from a lot of forums I've been a member of, the users all play nicely here. Why put restrictions on what can be done? Just because you -can- implement something like this doesn't mean you -have- to. I propose launching the website/forum without the restriction and if there's a need down the road, add it.