They’re just removing an antiquated file type that you should have moved on from anyway. All my books are in epub format and even if they weren’t calibre converts them so I don’t think this is a significant change at all.
All these lawsuits do is show me new cool stuff that Internet Archive has.
After years of using Feeder on my phone and some other random stuff on my laptop, I switched to FreshRSS on my server and the big thing is everything stays synced. My read and stared articles are all where they should be. I run fluent reader on all my devices and tailscale keeps me always connected to my reader so I can save articles on my phone when I don’t have time to read them then read them when I get home on my laptop or tablet.