Binance's, Huobi's, and Justin Sun's own Poloniex exchange accounts were used to attack Steem last Monday morning, March 2nd. They willfully powered up customer funds and proxied their witness voting to Justin Sun's @dev365 account. @dev365 then voted in bogus attack witnesses created by Justin Sun into the top 20, which centralized control of the blockchain.
If you don't know by now, a centralized blockchain is so pointless it might as well be an oxymoron. Attacking the network's consensus like this is extremely serious and was exactly the thing that the 0.22.2 soft fork implemented by the community's witnesses was trying to prevent. The formerly-Steemit Inc accounts @steemit, @steem, and @misterdelegation proxied to @dev365 and suddenly over 100,000,000 STEEM were voting for the attack witnesses. All voting with STEEM bought for pennies on the dollar from Ned Scott, or with users' STEEM that was on these exchanges. Not community consensus by any stretch of the imagination. Not decentralization. Binance CEO Changpeng "CZ" Zhao removed his exchange's proxy after some time which made it possible, with much effort, to return some of the community witnesses to the top 20. But not all of the attacker witnesses are out yet.
None of this would have been possible if not for Justin Sun conning Binance and Huobi into colluding with him to attack Steem. Of course with Poloniex he didn't have to ask under false pretenses. What these exchanges did, including Poloniex, was 100% wrong. They know better. Huobi continuing to help Justin try to hold the blockchain hostage with their customer's funds is unbelievably irresponsible. Poloniex has no business doing this either, but being owned by Justin I suppose it's hard to say no.
Both of these exchanges, and possibly Binance as well, should be boycotted if this is how they act as custodians of their customer's funds. If you have tokens at any of these three exchanges, I encourage you to withdraw them. Tell your friends to withdraw too. If you use these exchanges to trade STEEM, SBD, or any other currency, I urge you to find a replacement for them.
Update: Huobi has since expressed some regret about their actions to help Justin centralize Steem, and has announced their planned support of the community fork.