The difference may lay in the years that those you named had to adjust and readjust their countermeasures and learn from their mistakes ( up to a point ).

Hi, this reply is completely irrelevant to the subject matter, but i couldn't directly send you a message so this is my only option. quite a while back in a topic regarding bitgrail losing 170m you submitted a link to the bitgrail trollbox chat log in here

https://news.ycombinator.com/item?id=16355342

but unfortunately the link no longer has file, is there any chance you still have the chat log? i would be incredibly helpful.

Thanks

At this stage, as long as you are using a company like Stripe with enabled full transaction review settings, you can tap into this countermeasures (or even better) with few clicks.