It's actually available in paid subscription! Users asked for it a lot, mostly to block the recent political drama in US and Ukraine/Russia, Israel/Palestine conflicts.

https://www.newsminimalist.com/premium#block-topics

Pricing is pretty steep for an aggregator. I know running the LLM is expensive, but maybe there could be a "lite" tier that offers a very basic customization. Cache top scoring results and let people subscribe to one of _n_ pre-computed feeds with more or less news.