I also reckon that the subject of fungibility will have more importance and will not be taken for granted as it is today in the cryptospace.
And the upcoming Schnorr signatures and Confidential Transactions technologies will close the fungibility chapter, more or less.
These people won't be able to fight the cryptocurrency system when that happens. And let's not forget that this is all a big joke anyway, what the G20
really want is for anyone who wants to evade taxes or make "bad" money appear "good" to have to go through
their corruption system. Independents aren't allowed, but if you've got the money, these G20 politcians know how to wash it clean for you and who to ask (they know from experience). But cryptocurrency is too powerful a tool for their anti-laundering methods (aka their competition committee, lol) to ever make any difference.
Everyone can now have a Swiss bank account (Obama said it). Everyone can earn money tax free. Everyone can obscure where their money came from. And whether you (or the G20, or whoever) think that's good or bad is completely irrelevant.
They won't say it, but it's true. The current systems, whether banking, finance, regulations, law, they've all been built so these economies can manage them. People think they're doing us all a favour by monitoring and enforcing protection, but what they really want is to ensure they're not missing out on any new money and resources. They want their share, and their systems are tailormade to protect their interests.
All the complex financial structures, all made possible by lobbyists at the highest places, in tandem with all the reputable banks and auditors, so that money can be clean and legal in their eyes. So of course it'll serve them to have control over this new money, in return for their precious legitimisation.