I don't think just posting it on HN would work. (It's a ploy like digging a hole beside their path,then hindering their travel to "nudge" them to step off it where they might not recognize the hazard.)
what category of "evil online business ploy" do you have in mind? I see dozens of them daily with even brief, casual browsing. Also known as "monetization" ;-)
But it's not just online that I find these ploys. In fact, thanks to donating to the wrong non-profit, it's frightfully simple to end up with a stack of snail mail in the mailbox daily, often with free gifts to entice donations. I can't seem to find a simple, free way to turn it off.
Also, where is today's Usenet?
You can make a Tell HN post if it affects the HN crowd. And you can potentially make a page on the Consumer Rights Wiki.[1]
[1] https://consumerrights.wiki/w/Consumer_Rights_Wiki:Write_you...!