I’ve finally run some actual numbers, after finding a source for the data brokerage industry value (much lower, $319 billion in 2021). The link to your instance’s version is here: lemmy.world/post/10892972
TL;DR my conservative estimate is that every user is owed roughly $40 per year - but this doesn’t include Google or other businesses who keep and exploit proprietary datasets, rather than selling the raw data.