Online advertising is less and less about forcing a pitch to conversion in the moment its viewed. Even if someone with an ad blocker would never click on the ad anyway, repeat "impressions" build implicit trust just through exposure. Six months or even a year from then, when that user is looking for a specific SaaS tool, for example, the brand they saw 40 times already is the one that feels established and safe, and it's more likely to lead to a conversion without ever clicking the original ad.

The second part of putting so much effort into getting past ad blockers is tracking & fingerprinting, especially across devices.

In general, ads work by anchoring a brand name in your memory for when you eventually are looking for said product or service, the goal isn't always to force a conversion on the spot.