I like the idea of freelance online sellers being allowed in the platform, and for them to be verified if they choose to, and establish themselves as an online brand. In case the platform really goes worldwide, simple self made brands can be bought from anywhere!

This will be the Fair Ninja's part of the plan after they have launched their platform. They will initially cater to second-hand goods then they will eventually be partnered with local online sellers. You are right that the freelance online sellers can sell their creations or self-made brands to any part of the world because Fair Ninja aims to go global.
Ya. It will exactly be like that dude but local online sellers here are the small online stores that are also trying to earn. I like this, it means they will be helping the beginners to start their own and be counted as one of those giant online sellers in the future too.
I think they're main target was the online sellers before the online buyers in my opinion. Since it is online business connected and connected into
blockchain technology it means it will become worldwide for real of course.
Maybe online business is the priority of this project but they also need to prioritize the buyer at the same time, and as I recall they planned to give reward for every buyer that will use fair ninja to buy goods using their service... But there's smart contract for both to have fair transaction, and if no seller there will be no items to bought so i guess fair ninja need to prioritize both seller and buyer...
Of course they will also prioritize buyers. The success of their platform relies in costumers or buyers. If costumers will find fairninja to be careless and unfair, they will not return for sure. Good service is still the best and the key to more profit, both for the seller and the platform.