As shown:
When accessing the CSDN Security Center (external link), a Google ad pops up.
Specific link: Click to go directly—the link that triggers the pop-up ad
I also tried switching carriers (China Mobile
It is worth mentioning that after changing the target address, the ad no longer pops up.
Triggering device: iPad
Triggering location: Zhejiang
Security Center link involved: csdn - 安全中心
