My first thought for cryptocurrency when it first came out was "Oh, look, easy money if I felt like throwing my scruples and morals aside and actively participate in this!"
I'm still broke, so obviously I didn't sell myself out. Meanwhile many others I know who got involved in this are now facing IRS Audits and in one case criminal charges.
I'm somewhat glad my foresight saved me from ever making more than like fifteen cents and a couple 'free' pizzas off of this stuff years and years ago and getting potential charges. Knowing the disasters of a distributed database that works without explicit human permissions and checks like what we did in the late 70s, I dodged a big bullet, IMHO.