this is why centralization is dangerous especially if combined with bitcoin where there is no regulation, you get the usually "i was hacked all funds vanished"
bitcoin should only work with decentralized system for anything
Well yes. We have a system like Bitcoin that's completely decentralized but in order to access it, we are obliged to go through centralized channels. This sucks and this is definitely a weak link of the whole industry.
It will take much more time until we don't manage to deploy completely decentralized exchanges that would eliminate the risk completely.