This is true, have been looking for a good proxy but it's kinda difficult to get, do you work with marketplace too ?Why are you guys saying warm up and everything. You can buy a new phone, new sim. Invent a profile. Put an avatar as picture. Advertise on marketplace. And the add is going to get trough no problem. No warm up nothing.
The only problem you are limited to 1 advertising on FB when its new. When its warm up you can do 3 adverising and so on.
I think the issue is more proxy based. You got to make sure you proxy is not data center and not dirty. Then if you have those 2 it helps.