They not only last a lot of time with the moderation of the campaign, but also tell me that my sweep campaign has been flagged by various websites and that's why I don't receive quality traffic. 

That is absurd, I've run campaigns like this on propellerads, richpush, and various more without a hustle for more than 4 years. Is the first time I hear something like this.

If you want to run the usual vpn, sweeps and dating offers then I wouldn't recommend them, you are better of testing some well-known networks.