If you’re targeting aggressive niches on iOS, mainstream networks like Google and Facebook will block you fast, so you need ad networks that are more lenient. Zeropark, TrafficStars, and ExoClick are popular in this space—they handle high-risk verticals and allow more flexibility with creatives and targeting. Just start small, test your campaigns carefully, and scale only what performs, because iOS traffic can burn budgets fast if your ads get rejected or flagged.