Beyond the specificity that one can achieve in their desired content, I have data to back this up that it's much more space efficiently to be a degenerate furry than a normie.
I currently have 9,237 files in my normies collection to the tune of 35GB (almost all photos, rarely video). Compare that with 25,763 files in my yiff category, of which is also 35GB. Again, even more so, these are very rarely videos. And for the normie stuff, if you can get original content hot off the presses straight from their camera directly to you - no compression, size reduction, etc that websites and apps usually cause - these can be biiiig files by comparison.
I've been saving content for over two decades, and I'm kind of specific in what I like, hence the discrepancy between the two categories. I could absolutely see a typical person accruing 100GB+ easily. Especially if they prefer video, that number skyrockets.
Thanks for attending my UwUtalk.