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Extremely overstated. Those animals, while not in the group we consider true crabs, are closely related. In fact, they are more closely related than spiders and insects, or cats and dogs. It's not that Wow! Different animals completely unrelated to each other keep evolving into crabs! It's that crab-like animals keep evolving into crabs-like shapes. This is one of those pop-science things that really drives me bonkers because it's just objectively not true. Your image is comprised of the pink and purple sections, maybe some red and orange. The comparison being drawn here is like asking why tigers and cats have the same body plan. It's insane and I can't stand it. Maybe try BuzzFeed? That one might be more your speed.