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It depends on what you're doing with the 1.7GB - the amount's big, sure, but it's lower than many of the 'professional' games out there, and if you have a lot of scenes/levels in your project it could be understandable. I know my project 'Miniature Multiverse' is likely to approach that sort of filesize range, and I've got a giant batch of stock media [textures, video files, etc] already posted, that is 1GB in size, just barely fitting within the normal limit.  Basically, if your project's ambitious in scope with a ton of content in it, and you really need the filesize, then by all means use it. See if you can get the Itch.IO staff to approve it.