No stomping them spidahs, or one of these guys will visit your house. This is the Brazilian Wandering Spider, one of the most venomous spiders there are, and an aggressive bastard to boot. It's toxin causes loss of muscle control and breathing problems, eventually ending in paralysis and suffocation, in addition to intense pain and inflammation. And then there's the brutal effect of causing hours-long, very uncomfortable boners that can cause impotence.
So yeah, don't mess with them spiders, or they mess with you
Or more likely it's been either milked of its venom or had its venom sacs removed. Would anyone bitten by one in the wild seriously just pose there with it on their arm instead of seeking immediate medical attention?