Why do I need to provide viewer access and link my channel?

Why do I need to provide viewer access and link my channel?

Granting viewer access and linking your YouTube channel to VeeFly’s Google Ads 
account unlocks advanced metrics and targeting features. According to VeeFly’s 
guide on linking channels, this integration allows VeeFly to run targeted 
campaigns and access analytics like view counts, subscriber counts and 
engagement, while maintaining your channel’s security. Linking does not give 
VeeFly control over your content; it only shares basic data for optimization.