I hope I'm wrong, but...
What's to stop folks from becoming a tech freelancer for ten years, enjoying the tax-free status, then moving abroad for a year or two (to cause your citizenship to lapse as far as the tax authorities are concerned), then moving back & starting the cycle all over again?
How many times can you make use of the tax-free program before the government figures out that you've not paid for decades & yet still consume resources as if you were a normal tax-paying citizen?
I don't see such a program ending well in the long run, but then I hope I'm wrong...