It's a fair concern, but if I'd bet it's not an issue. We used to kill millions of these things every year in the 20th century for fertilizer. Even if we killed

It's a fair concern, but if I'd bet it's not an issue. We used to kill millions of these things every year in the 20th century for fertilizer. Even if we killed every single one we harvested for blood we're talking half a million a year. The horseshoe crab survived decades of much worse. Of course, it's definitely something we should keep an eye on, just in case.