Minecraft and No Man's Sky are definitely NOT infinite.
No mans sky is almost 1000000 times bigger than the minecraft map, having almost 18 quintillion planets (yes. QUINTILLION).
A mod of this size would require a monster graphics card and would take a very very vey very long time to make.
(The only reason that No mans sky can run on PC's is because its divided into chunks like minecraft, however, even with these chunks, the mod would still be huge and would crash minecraft.)