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.