This data includes data that allows fraudsters to steal the funds of these traders?
The case is nearly a year old, but since this thread has resurfaced, it’s worth mentioning that the breached data details don’t seem to be crystal clear, although we know that over 1k emails and 13k rows of information were obtained during the hack. I’ve been looking around for further detail of the involved data fields, but came out empty handed.
It’s fair to assume that perhaps at least some specific crypto names and amounts were involved. Their software (see https[colon]//cryptotrader[dot]tax/cryptocurrency-tax-reports) also details information to generate the IRS Form 8949, which includes name and SS number, so this detail of information could have been compromised, although the claims say they weren’t:
CryptoTrader.Tax users had to enter their billing information the payment processor Stripe to pay for their subscriptions. However, Stripe assured that, while its system is connected to the hacked CryptoTrader.Tax support center platform, the link does not reveal sensitive user info such as credit, debit, and banking information as well as the physical addresses of its clients. As such, only customer email addresses and the general location was exposed by the hack.
https://tokenpost.com/More-than-1000-users-affected-in-a-cryptocurrency-tax-reporting-service-hack-5712With the above, and assuming the limited scope, fraudsters/hackers should not have been able to directly obtain access to the crypto of those involved in the hack (it would have to involve credentials to custodial wallets, which is unlikely to be stored in this type of application; private keys are out of the question here).
Nevertheless, they could have used social engineering to try to trick/scam/blackmail/phish a few of the 1K affected by the hack. It will also depend on the time it took between the events took place (April 2020) and when they were actually communicated to those involved (general public was made aware months later, but those affected were possibly told before).