I don't see how it can be a copyright problem to allow people to save it privately. Especially since every copy is deliberate, i.e user chosen to save that particular page.
YouTube DL was alleged to be bypassing copyright protections which doesn’t apply to media without any protections like public web pages.
And in any case, it seems the software was reinstated by GitHub after The EFF intervened.
Youtube-dl had a takedown because they specifically ran a circumvention in their tests. They removed the test and were restored.
Youtube-dl is still freely available.
Saving web pages is not illegal nor prohibited.