Well ... if these companies also have troubles with such attacks, how can Poloniex prevent them ?
Check this :
Someone is learning to break the internetWhat Polo does is not right.
I think they should turn off margin trading during DDoS attacks but they won't make the money from it.
Scary stuff.
And yes, that makes sense as a way to prevent (or at least minimize) loss of funds. If the server is having issues, things like new margin orders, new signups, and maybe even customers with no open orders and no holdings of any cryptocurrencies outside of Tether should be refused until the problem ceases.