It is too early to talk about any effect, only 17 days have passed.
I've noticed more people joining like mocacinno/BlackHatCoiner/witcher_sense in the last 24 hours.
I think ABCbits aka ETFbitcoin is the highest ranking member in terms of merits who join.
Honestly, there is quite a lack of quality discussions there. A fairly small number of members (mostly teleported from here) influence the quality of the conversation, and it is not easy to maintain continuity in writing meaningful posts. It's a good thing that the admin noticed an opportunity for the growth and improvement of the forum, so he works quite actively on it.
Let's wait and see how long will they be able to allow mixer advertisement on their forum. At the moment there is not a big traffic and nobody cares about their forum and when mixers will be banned, they will be forced to disallow its promotion.
Mixer ban is theymos' decision, there is no question of regulation, they are still legal services. So just a rule of the forum, not global at all. I think that the Alttalk admin himself confirmed that he has no intention of banning mixers, at least until it is not punishable to talk about them at all.