No transaction fees
Did I mention it's insane? Variable fees are the worst when someone want to plan their costs, static tx fee is better, but it makes some use case impossible (like Steemit).

Actually the idea came from Bitshares - previous project, where Dan was a lead developer, (where that was never implemented)

I was on this Mumble session, check this out: 22m50s

and then @dantheman (aka bytemaster on bitsharestalk forum) said:

Could we imagine a scenario where the blockchain had no fees, at all?

Actually I need to finally make a t-shirt with that phrase:

:)