While the delivery speed may change, the remains the critical bottleneck. Most services selling slow followers utilize "ghost accounts" or automated bots. These followers do not interact with content.
This creates a significant problem for the —the ratio of interactions to total followers. As the follower count grows without a corresponding rise in engagement, the account’s ER drops. Because Instagram’s algorithm prioritizes content that receives high engagement relative to its audience size, purchasing followers (even slowly) can paradoxically lead to a decrease in organic reach, as the platform perceives the content as unappealing to its own "audience." Conclusion
A temporary reduction in the visibility of posts to non-followers.