I have these as well, and do not want them. They’re not in the project settings > View team’s libraries, and removing them from Assets > Libraries (both Current file and Community) only does so on that individual file, with new files adding them automatically.
🤔 I can’t be entirely sure on my end, but is there a chance that an admin on your end published these library files organization-wide?
That may explain why these suddenly appeared, and why you can’t remove them. If an admin published them to be used organization-wide, it can only be removed/unpublished by an org admin.