According to academic work published this month, a quarter of the Alexa Top 10K websites are using browser fingerprinting scripts
-30% of the Alexa Top 1K
-10% of the Alexa Top 100k
zdnet.com/article/a-quar
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Some scripts were used for bot/fraud detection, but many sites loaded fingerprinting scripts that were designed specifically for tracking users
More concerning, academics also found a bunch of new fingerprinting tricks that they hadn't seen before.
Ad tech never stands still
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Regarding requestAnimationFrame, to me it has nothing to do with any form of fingerprinting. It's likely related to detected if an ads is actually seen (or if the tab is opened), as explained in this blog post: adtechmadness.wordpress.com/2019/03/14/spo