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Even today uBlock Origin is not able to run as intended by the author in Chrome (and maybe all other Chromium-based browsers). According to gorhill, the only browser that is able to unleash uBlock Origin's full potential is Firefox.

https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-b...

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brave blocks those for ~2 years now:

https://brave.com/privacy-updates/6-cname-trickery/

Luckily not many ads seem to be using these evasion methods, so Ublock works just fine on Edge in most cases.

Ad domains being cloaked through CNAME records is really common nowadays (actively used by Adobe, Criteo and Eulerian, etc), and most analytics and ad software providers employ these tactics.

https://portswigger.net/daily-swig/web-trackers-using-cname-...

https://medium.com/nextdns/cname-cloaking-the-dangerous-disg...

I use Ublock and never see these, so I guess it depends on your definition of "really common".

They are more common when using trackers and analytics (in the title of both the articles I linked), which you don't "see", unlike ads. It happens in the background

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