For important projects like this (libjpeg, libpng and others) it would make sense if there was sort of place to get all of them apart from mirrors. What am I saying, that place[0] exists. Developers shouldn't have to shoulder the burden of hosting their code if they don't want to or don't wish to weather the expense. It certainly seems in this case they couldn't pay for self-hosting (or friend-hosting or whatever thi…
GitHub will rot some day as well. (I think we're already seeing it start to decline.) This is simply a permanent problem. Archive.org and to a lesser extent IPFS are viable solutions for archiving, but _contingency_ plans are I think the missing component here. Pray for the best but prepare for the worst.
Gitlab et al are growing, and now AWS has its own integrated solution, but I don't see Github going anywhere for a very, very long time. (Barring catastrophic happenings, of course.)