Yes, making illegal transactions easier is by it's pure definition not good, if that's the ONLY thing that is done, which is not the case.
I mean just by him inventing Windows and pushing mass adoption of computers, he basically is directly responsible for all the illegal shit people pull off these days through computers and the internet according to his own logic.
He's responsible for the darknet, for child pornography on the internet and any other kind of shit you can imagine. After all more than 90% of the people use his windows to do all that shit.
So his argumentation is complete crap and since I don't think he is that stupid to not see this, I just feel like he's pushing an agenda here. If someone else would have said that, okay, I'd just assume that guy has no idea what he's talking about, but Bill Gates is responsible to a large part for the mass adoption of personal computers and then saying that a new technology is bad and directly responsible for some illegal activities can be applied in the same way to anything he has invented himself and I can't see how he can not know that.
I mean it's not like there was no darknet and no internet drug sales before there was Bitcoin, right?