Only time will tell for sure. I think the shift from SourceForge+Patches to Github+PullRequests drove significant change in the number and demographics of devel

Only time will tell for sure. I think the shift from SourceForge+Patches to Github+PullRequests drove significant change in the number and demographics of developers actively committing to open source projects (that is just a belief at this point, I haven't found hard data to confirm or deny it). Large multi-developer projects like the ones you cite in the Debian data tend to be older because it generally takes time for projects to mature to large developer counts. If that's the case (and all this is very much data-poor speculation), then you would expect larger multi-developer projects today to preferentially exhibit the older GPL-biased license preferences in ways that an equivalent sample in 2025 would not or would with lower strength.