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Glad to help you. Ask away. Questions are always a good think on Leothreads.

Bitcoin , Ethereum and other big coins are PoB based?

No. Only Hive and Steem.

$BTC = Pow
$ETH - Proof of stake.

Actually Hive is delegated proof of stake with PoB over the top.

It means that Hive and Steem are doing great.

The community will be big in the future because it generates great contents.

Well I would dispute that Steem isnt doing great.

In fact, I don't know about Steem in depth.

No need. It is centralized. Justin Sun took over and runs all the nodes basically.