(Just kidding, this perspective would fall under victim blaming, I think.)

It does seem unnecessary for a bank to be interacting on social media, though. How does it make sense for them to spend time on it?

The financial I work for has official channels on most platforms and dedicated teams who do basically advertising and customer support type stuff via social media channels. Complain about something on @OfficalBankChannel, and someone can see it and hopefully respond positively. This isn't just some random employees slacking off on Instagram or twitter or whatever; it's their job.

So if the bank perceives someone is threatening people over a social media channel, it can be treated the same as someone threatening over the phone to a call center or in a branch location. And there can be consequences.

Probably a typo on his part but that’s certainly a threat in my opinion.