See also https://meta.wikimedia.org/wiki/Terms_of_use/Creative_Commons_4.0/Diff
The proposed waiver of database rights that was to accompany the move from 3.0 to 4.0 was one of the sticking points, I believe. To quote:
Where you own Sui Generis Database Rights covered by CC BY-SA 4.0, you waive these rights. As an example, this means facts you contribute to the projects may be reused freely without attribution.
For further background see
On Thursday, September 30, 2021, Strainu <
strainu10@gmail.com> wrote:
Hi Isaac,
See https://meta.m.wikimedia.org/wiki/Terms_of_use/Creative_Commons_4.0
Strainu
Pe joi, 30 septembrie 2021, Isaac Olatunde <reachout2isaac@gmail.com> a scris:
> Hi Strainu,
> I can't find the previous discussions.Could you please provide a link to the public consultations (or proposal) you mentioned to allow people on this list have a clear understanding of what was discussed?
> Best regards
> Isaac
> On Wed, 29 Sep 2021, 23:22 Strainu, <strainu10@gmail.com> wrote:
>>
>> Hi,
>>
>> A few years ago there was a public consultation on moving the Wikimedia license to cc-by-sa-4.0 instead of 3.0. Now, obviously that never happened but I couldn't find the decision documented anywhere. Why was the proposal scrapped? Are there any plans to revisit this?
>>
>> Steainu _______________________________________________
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