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So this single miner should be big.. Or the whole network is too small? .. But it's over 4 TH/s

It could be either way. But if the network was big enough even a huge miner won't be able to manipulate it.

Nice information by the way. I also see you're yet to join the projectHope community on discord, we have a very interactive discord channel and a lovely one at that where you can learn more about the project hope community and interact with other members.
Join us here : https://discord.gg/YEQrthn

I'll be expecting you buddy!