We'll probably get there soon. If I bomb a power plant as an individual, I'd be a terrorist. If as instructed by a nation, it could be a causus belli, or act of war. If I use a cyberattack, it's all good.
I think it's the same for economic warfare. We've frozen the assets of Russia's central bank, which is pretty hostile. We've frozen or seized assets of other civilians, which is pretty hostile. Especially given that's arguably collective punishment, and against Article 3 of the Geneva Convention. Which is probably why Russia insists this is a 'special' operation. Rules change once it's an officially declared war.
But for a long time, we've had wars that looked like wars, were described as wars, but legally were not. No war declarations for Gulf War 1 or 2, the Afghan War, the Syrian War. Or the general 'War on Terror'. But then wars are between nations.
Sorting the mess out and modernising the Geneva Convention to cover stuff like economic and cyber warfare is probably long overdue, and find out the hard way. But then economic warfare has been extremely profitable, so countries might be reluctant to give that up.