Hmm Twitter already sells its "firehose" to the highest bidder.

I’m sure twitters algorithms take advantage of all interaction data, like impressions, scrolls, and clicks. Agree tho it’s good a lot of the data is public.

Publishing user scrolls is a "massive hill" and a legal/privacy nightmare?

Sure seems like it could be - I wouldn’t opt-in to allowing mine to be distributed, why would I? And I don’t think Twitter has the rights to do so. So you’d at least need to solve the anonymization problem, or you’d have to package a data release such that you can replicate the ranking algorithm without it.

User clicks in form of "likes" are already public so why would scroll data be so sacred?