I feel like I've seen this behavior on other sites and systems as well. I've no doubt the prioritization initially works, but it seems there are other factors at play that seem to bring up old data.
In my case my team is not nearly as popular as Nebraska so I suspect the logic very roughly ends up something like "Ok he watches college football and oh hey this Nebraska story is really popular and stories about that team are big now so here ya go..."
I spent a year slowly cultivating a pretty decent feed of relevant content on my Pixel, and it went full Netflix 2010 seemingly overnight.
Early Netflix suggestions, no matter how selective and consistent your selections over many years, could be instantly subverted by your lonely sister-in-law getting on your account one Saturday night and watching a few foreign language romance flicks. After that, you'd never really stop getting recommendations for "movies starring sexually aggressive male leads" or "films with actors who look like Antonio Banderas".
I think I'm done being used to train everyone's algorithms.
What's wrong with Netflix anyway, that one off-topic movie can sway your 'preferences' so drastically?
Hal 9000 failed because he was told to lie.... You'd think that prioritization would be easy on the outside. Granted it was a story but it seems to fit that a minor change results in a collapse as far as function goes.
It's one thing when something you don't care about keeps showing up. It's another to think, "I'm actually interested, but if I click this once, then I'm liable to effectively commit to this staking a permanent place in the half-interesting things that fill my life from here on!".
Unfortunately in reality that doesn’t seem to be the case. Last week I bought some wireless headphones, and now my feed shows a bunch of those. It also keeps showing me books by an author who I bought a series from, but never finished (on Kindle). And a selection of Spanish books, that my wife needed once for her studies. And for some reason a load of large kitchen applicances.