> One can really store 4KB of arbitrary data with a url minifier system and share it for free.
Free for you, not free for the minifier service.
That's like saying "One day while I was at Chick-Fil-A I had an epiphany while putting honey on my biscuit. I thought: 'Chick-Fil-A is really nice to provide all this honey for free.' And then it struck me... One can really take all the honey they want and use it to refill their bottles at home one honey packet at a time."