Copyright needs torn up or at the very least significant reform but if you're going to be skirting around the edges of it to try to do a good thing it's probably a good idea to not just straight up obviously and blatently break the letter and spirit of the law. CDL is an awkward and dubious workaround but if you drop the 'C' you're just doing copyright infringment and that would be much better left to entities like Anna's Archive. The criticism of IA in this regard is usually that it was a bad strategy, not that the goals were bad.

There may be newer laws with different spirits, but I thought the original copyright spirit was "other people can't sell your work without permission" and not at all about preventing free sharing.