It wasn't enough for STINC led by Justin Sun to freeze accounts of some of the most vocal and large Steem holders who moved over to Hive but he now wants to null the accounts too.

Furthermore, the number of accounts being nulled has increased in preparation for the hardfork scheduled for some time tomorrow.

List of people being nulled.

Will the exchanges support this Hardfork 23?

Firstly, all this information that we are getting about the possible nulling of balances is all coming from leaks and an interview by Sanghyuk Park on Joind.io with Tripple A, a Steem Witness, seems to confirm this.

Note the page is in Korean so you need to Google Translate it.

Finally, the 23.0 hard fork also includes responses to attacks that have been on the Steam blockchain. It is closely related to the aforementioned hard fork background. Account seizures are scheduled for accounts that pose a direct threat to the Steam blockchain or seize the legitimate assets of Steam holders.
This was included as judged to be an indispensable measure to improve the network stability and user environment of Steam.

The code for the hardfork is private on Github meaning the code cannot be audited.

I have a hard time seeing the credible exchanges supporting this Hardfork because of this, but you imagine Poloniex, partly owned by Sun, will approve it as well as Binance.

That leaves Huboi and Bittrex who might be forced to suspend or even go as far as delisting Steem in the near future.

If you have Steem bags know they are not SAFU and exercise caution in your further dealings on the Steem Blockchain.