Several thinks ArchiveTeam have grabbed a lot more historical than what's available at for example InoReader. I personally think so as well.

There's also no telling if InoReader is open for grabbing what they've grabbed already again. Meaning it's potentially behind closed doors.

ArchiveTeam submits the data to Internet Archive, which anyone can upload and download from. This data is continously being uploaded and made public and free. See https://archive.org/details/archiveteam_greader for example.

Anyone can do anything with that data. Your OPML files are not being submitted though. That's also being said on the linked site for this item.