Why is this a good idea?
I understand that this is great opportunity to scrape otherwise-inaccessible sites, but whom is this intended to benefit? Is it just the people scraping?
Is this not malicious abuse of charitable giving?
I agree with the question. I don't know if we should avoid this. But I think we should consider whether, for example, these sites are opening up with the implicit expectation that people will take advantage of it for covid-related purposes; and whether, if we just start scraping everything, that'll make them or similar sites less likely to open up in future.
Some sites are free due to the coronavirus and we should scrape them. Please list any temporarily-free websites you know of, such as https://www.uptodate.com/
To download sites I recommend https://github.com/ArchiveTeam/grab-site
Consider whether you want to use --no-offsite-links. Otherwise it will pull every linked page and its resources (and sometimes even embedded videos).