Each family member has their own laptops and phones, and take dozens of high resolution images every week, school presentations and projects, receipts, and tax documents, videos -- lots of videos.
As a family of 5 with 2 working parents, I'm not really monitoring data use and want a mostly hands off solution to their data storage. And every new phone has a higher resolution camera though maybe JPEGXL will help us there.
We pay for 2TB of icloud data, but I am already eyeing upgrading to 6TB -- but that adds another $22/month. Moving to other cloud providers may save somewhat, but then its another management of a cloud ecosystem, and I know my family will mostly stick to icloud.
On a side note, we store alot of data on google drive too, and google takeout fails everytime I try to download a 50GB file -- so really its trapped there?! All of these have a lockin factor since with more and more data its a huge effort to export!