Apple shutting down Photo Stream has me unhappy. My family's photo libraries won't fit into the iCloud storage tier I'm on.

https://support.apple.com/en-us/HT210705

Information about the My Photo Stream shutdown

My Photo Stream shut down on July 26, 2023. If you already have iCloud Photos enabled on all of your devices, you don't need to do anything else — your photos are already uploaded and stored in iCloud. 

Apple Support