As for graphics cards, those have a hell of a lot more memory on them nowadays and faster than main board expansion chips. And once the main board chip space is full, that's all that can be added.
As for IRS, what they want is to tax the "profit" on the coin that you held for a while, that's what they are after. And yes coin transfers are traceable, that's how that all works. As for tracing illegal activity, well it can be done, but, national borders heavily interfere with that.
I do note that a basic user will not have issues. But, IRS, DEA and ATF are in the same office in most cities.
As for using in hobby, again, there's transaction fees every single time regardless of amount. And why would any one expect a gal to have an account? Especially with the dead historical figure little green trading coupons being as accepted as they are. Even in other countries the American version are more accepted than the local version.