Some of them do, while some libraries proactively take steps to /block/ people who make egress Tor connections from the library’s network, which is a revolting contrast to the librarians who care. The same libraries who block Tor also impose SMS verification on Wi-Fi users. Note that article is US based and only the US has a “Library Bill of Rights”. Outside the US it’s quite a different story.

I wonder if it’s because privacy is in such a poor state of affairs in the US to start with that the US libraries are motivated to give some refuge.