[stevenAthompson]

I can think of at least five reasons to use this that aren't illegal, including the fact that the law doesn't work the way this person thinks it does.

The way he phrased it has turned me from someone eager to discuss the potential uses of this into someone unwilling to engage with him to discuss it any further. Even if it turns out that he's absolutely 100% correct (he's not) I'll talk to someone else about it instead.

I suspect this person regularly has "conversations" where the other party suddenly becomes silent, and he misinterprets that as a "victory" instead of the other person deciding he isn't worth the trouble.