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Even then. Try to send me a `Hello World` webpage both ways and guess which one will actually get clicked on and seen

Take discord for example: you can only post a file of certain size, but you can post unlimited text

Discord messages aren't actually unlimited; they are limited to 2,000 characters, unless this restriction was recently removed. I have personally encountered this, mainly when using code blocks.

Can you tinyurl a file?

Can you tinyurl a url with more than a few thousand characters?

Even if this were possible (which, even if tinyurl supported it, would break most browsers) you would be effectively hosting your content on tinyurl.com. Again, this is no different from hosting the file on any of a zillion public data hosting services.