This meme I posted a little while ago is a good example. It currently has no engagement according to Primal, but nostrudel shows 2 reactions from 2 different npubs, which would generally be enough to get into the 1h Trending feed these days, possibly attracting more engagement. It's a subtle bias with a strong effect.

nostr:nevent1qvzqqqqqqypzqamkcvk5k8g730e2j6atadp6mxk7z4aaxc7cnwrlkclx79z4tzygqyvhwumn8ghj7urjv4kkjatd9ec8y6tdv9kzumn9wshszrnhwden5te0dehhxtnvdakz7qpqfm7lcwlmdmmpgfkpf2r3arth78n746vllc52dkq9zhndpv4mxflqt4wmd4

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Important caveat: it's possible that if these reactions were counted, then 2 wouldn't be enough to get into Primal's trending feed anymore. But it often only takes 1 reaction, so it couldn't be too far off.

My DVMs still count them. They are available in primal. At least those who are not personalized.

Reasonable not to include personalized ones since some aren't actually meant to be positive

They consider things like your followers etc. It's simply not possible on primal as users don't communicate with the DVMs, but the caching service does.