I would think “don’t eat that stuff” would be a no-brainer. Gross.
The green stuff was my favorite part when I was a kid.
I also liked raw sea urchins, too.
That icky green stuff serves as the liver and pancreas of the critter ... I’ve never developed a taste for it, although many consider it as delicacy. It really doesn’t taste that good anyway .. and it does look awful.
So when you think about all the toxins getting filtered and trapped in that stuff ... fugetaboutit! ;)