Gaming

These seem to be the four major points:

clear and transparent pricing and pre-contractual information;
avoiding practices hiding the costs of in-game digital content and services, as well as practices forcing consumers to purchase virtual currency;
respect of consumers' right of withdrawal;
respecting consumer vulnerabilities, in particular when it comes to children;

First one actually seems pretty well covered by Warframe already. Second point can be met just by displaying the real currency price next to the plat price, calculated based on what people on average give per plat when purchasing through the Warframe website. Third point... Yeah that's going to be a point of contention for sure. That'll require a redesign of the plat system. Fourth point I'd also say Warframe does. Their 'oh shit' moment when they ended up creating a slot machine with, what was it, kubrow skins? Demonstrates them actually caring about this already. Basically they saw people interacting with a new mechanic much like one would a slot machine, and then soon after rolled it back and refunded everyone who had spent money on it.

Considering you can't sell platinum for money, you could add complexity by converting it to another currency when exchanging hands. No value lost, exact same ratio. You buy platinum, you spend it on the store or it decays when you give it to another player. Platinum carries real world value, decayed doesn't. Would that work? The only reason for doing that would be to obfuscate the fact platinum has real world value. The players being constantly aware of the fact might mess with the economy.

Honestly, their monetization is really something I could never criticize.