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It looks very much like the only reason he is keeping his witnesses in there is to prevent his stake from being frozen again. Well that and to possibly to do a hardfork to bail out the exchanges he used to help him gain access to his stake again.

Buying and Selling is legal behavior.
Do yon confirm that Steem don't belong to Steem Inc ?

There is no Steem Inc. And if you mean Steemit Inc, of course Steem doesn't belong to it. It's a blockchain collectively owned by a community. A single person or entity does not own it. Justin didn't and can't buy us, no matter how many empty promises he makes.