Not to mention that this still isn't legal, at least in the USA.
That said, the top line above the table of contents does say that many of these are supposed to be satirical.
> Startup Ideas: Proposals for new technologies, businesses, startups, *satirical* or serious.
I suspect a lot of people may be getting caught up on items that are genuinely supposed to be satire. Whether its good satire or not, reasonable minds can disagree. But I find it unlikely that three you picked out weren't intended as satire. However, I'd also be surprised if a few unreasonable people didn't seriously consider building a business around these.
There is a pretty famous SCOTUS case on this, Ashcroft v Free Speech Coalition. Given the ruling I don't think it's illegal, although you'd definitely have legal challenges.
Not to mention that this still isn't legal, at least in the USA.
That said, the top line above the table of contents does say that many of these are supposed to be satirical.
> Startup Ideas: Proposals for new technologies, businesses, startups, *satirical* or serious.
I suspect a lot of people may be getting caught up on items that are genuinely supposed to be satire. Whether its good satire or not, reasonable minds can disagree. But I find it unlikely that three you picked out weren't intended as satire. However, I'd also be surprised if a few unreasonable people didn't seriously consider building a business around these.