i wonder how many of the exchanges realized they were locking funds.

If they realized they were locking funds, then it was by Mr. Tron's word that they would be unlocked, else they basically stopped being an exchange for STEEM, and are now have stolen all the STEEM.

The truth behind that will be seen shortly.
Which exchanges say, OMG we're sorry, that was bad, bad, bad, we will do what we can to fix it right now.