Legal types don't like the Unlicense either as far as I can tell[1].

You'll find software that is dual licensed CC-0 and something else, too,[2,3] because anything public-domain-ish with no attribution may be perceived as too risky.

[1] https://softwareengineering.stackexchange.com/a/147120

[2] https://github.com/BLAKE3-team/BLAKE3/blob/master/LICENSE

[3] https://github.com/LoupVaillant/Monocypher/blob/master/LICEN...