For ads, I believe this must be a problem for ad platform owners.

If the digital platform's storefront is their business, they could afford to spend some budget on bot detection. Bots still come from data center networks, sometimes render pages incompletely, request resources in bulk, and show enough patterns to be flagged internally.

If we look at a medium website, most random crawlers will come from Amazon, Microsoft, DigitalOcean, Hetzner, OVH, and a few other DC networks — these can be blocked easily without harming real users. The rest can be detected and cleaned up, even manually.

The math is simple: 20,000 visits a day at 15 seconds each = ~83 hours a day lost watching a Cloudflare logo, just because someone doesn't want to dig into the logs. I don't buy it.