It would be instructive to learn the full details of how this happened, after the vulnerability has been blocked.

Right now it seems unusual that the largest exchange did not have a security scanning system to block bc1 type bitcoin addresses that was already known in the industry to be associated with a lot of threats.

And also an explanation of how they overcame the 100BTC limit on withdrawal per account, which is in place for verified accounts.

More on these here:
https://steemit.com/blockchain/@kenraphael/could-binance-have-lost-more-than-the-reported-7-000-btc-and-what-more-exchanges-can-do-to-enhance-security