Fair enough, but of the 4 links you posted only 1 of them even has the words fatal or euthanasia involved.
Of the posts in the 1, 2 people cited anecdotally that they believe maybe possible it may have happened a few times to people who are not themselves that a spider died because it was a spider.
The one person who mentioned problems cited a HGW / Spider breeding, which is known to have severe issues up to death.
TL;DR - until you can find an example of an individual who had a spider die or had to euthanize a spider under his or her own care due to the spider wobble, don't throw the words euthanasia and fatal into a post in context that suggests it as fact.