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Yes, it's this line:

Steem Dollars (SBD) has been designated as a cautionary item, and as a result, the deposit service will be temporarily suspended.

That suggests to me that nobody can trade on it. But according to CoinMarketCap, on Upbit, it's rocketed to over $7. This makes no sense to me at all!

Not being able to deposit or withdraw doesn't mean that holders on the platform can't trade it, they're just in an isolated bubble. As to whether the trades on Upbit make sense, that's a question that could also be asked about times when deposits weren't suspended.

Ah, ok. So they can trade it and deposit and withdraw other funds (inc. FIAT) but simply can't deposit and withdraw the coin itself?

Right. Exchanges usually handle deposits and withdrawals of coins independently of each other and can enable and disable them for a variety of reasons (suspicious activity, maintenance, hardfork, etc.). And usually trading happens internally to the exchange between individual accounts, from their POV whether a trade happens doesn't have to be tightly coupled to whether people move stuff onto or off of the exchange. They have fine-grain control over everything they do (it would be hard for them to operate as a mulit-currency exchange if they didn't since different conditions can affect different coins at different times).

good Question but i dont no

I have no idea, where this price for SBD comes from. I wanted to buy STEEM on the internal market at a ratio of $7+ (SBD) to $0.28 (STEEM). I would have gotten just under 7 STEEM for 1 SBD. I have no idea where these fantasy figures come from.

I've been wondering for some time what exactly justifies the general value of STEEM anyway. :D