I fully agree! I'd greatly prefer uploading as a download. And I really don't wanna spend precious time during this gamejam exporting/testing a game on operating systems I've not used in several years/ever! From what I've seen you need a Mac to export for Mac, which is an weirdly high bar for a 3 day game jam likely full of not-super-experienced developers. I assume this rule was added to be inclusive to every user, yet it just feels exclusive to most devs.