Alright let's take a look…
So they are "cyber-based organisms" which have very contradicting properties as organisms need anatomical body parts so unless a random floating body jumps at me while I'm browsing the web this sounds more like an AI or computer virus of some kind.
You claim they can contact humans and the foundation, and assuming that computer didn't really exist or are as largely used now as before, it's a wonder how these 'creatures' survived the early day of the internet.
Anyway another issue arises if they do cause economic collapse as the money they'd be eating are either A) So rare that they can't be readily found and they die or B) The money is super-inflated and eating an equivalent of a dollar is like eating a bread crumb and they die. So both options would result in the deaths of their species.
Next up, if the Foundation does hire lobbyists to lobby congress and pressure them into making and passing a new tax bill to feed more of these things, then the government is basically screwed. Because most Senators and Representatives (who are majority Republicans in both houses) would like to keep the tax rate as it is or reduce it, that would only mean that whatever efforts the Foundation is putting into having this new income tax bill pass is highly unlikely.
Here's a question I ask:
Where does the money go when they are "eaten"? Some off-shore shady bank? Or do they simply disappear? If the latter then the commerce would practically cease as the government realizes that money is growing in value as the actual amount in circulation decreases drastically and then that would probably lead to total government collapse given a few years of this happening.
So honestly, don't like the idea. Would recommend against writing it but you can still try just to experience the process and get a feel of writing articles and coming up with ideas that could work better.