I wonder why people should still be using a wallet that support only legacy address when there is Segwit today. Any bitcoin wallet, that also support altcoins or not should not be used anymore if they can not follow the recent standards.
Don't know, I've never held bitcoin on an Atomic wallet (though I did download it for desktop just to see what the UI looked like) but that's probably not how they got hacked, right?
I don't know why anyone would use Atomic other than to take advantage of their staking function, but even then if you're staking a significant amount of whatever, why would you use a closed-source wallet like that? It must be popular amongst those who don't know much about crypto security--but then again, a lot of knowledgeable crypto users kept coins on Ledger wallets right up until they announced their back door. That's humanity for you; it's in our nature to want to trust others....until we learn the hard way not to.