How large is the illicit economy worldwide and what percent has to flow through BTC for it to matter?

serious question. I think one of the genuine bull cases for continued Bitcoin price appreciation is that it exists as one of the easiest means of transaction for gray and black market business. whether this is morally good is not my point and is irrelevant to the case. it matters because extra legal transactions are, will, and have always been a decent share of an economy

so my question is, does anyone have estimates on these market movements? I’d be curious about volatility and what amount of illicit funding flows through BTC. not that anyone would know. for example though I’ve seen reporting that Russia subverts tariffs by transacting in Bitcoin. large multinationals, nation states, etc