What is the credibility of the above-mentioned hacker forum?
Usually this cyber threat investigators knows what hacker forums to look at, so I have no doubt that the source forum could really be legit source.
I'm not sure if E-Toro already recognised this hacked or supposedly hacked. But based on the article the hackers have started to make a name for himself and even getting hired by other group of hackers to get him onboard because he has been hacking a lot and being successful.
It's a job for most of this criminals, the hackers could really be making a name in the hacking world and this is his way to be known to his fellow criminals, his career his starting only and it is very scary.
Even google is promoting their copy trading advertisement on various platform so yes there will be lot of new people entered into the site for trading activities.But how such amount of accounts can be stolen, is the database got leaked or they used to hack individuals.
This has nothing to do with Google, if they are getting paid handsomely, they will promote it in their platform even in Youtube.
The best way to combat this one is to update and change your password immediately and then withdraw your money from it.