Carcinization is an example of a phenomenon called convergent evolution, which is when different groups independently evolve the same traits. It's the same reason both bats and birds have wings. But intriguingly, the crab-like body plan has emerged many times among very closely related animals.
I posted quite a bit on /r/conspiracy on the pandemic ...after that I got banned from posting on /r/vaccinelonghaulers and all the city and country subs eg: /r/korea. Still have my account and I can still post on places I'm not banned.
...just subbed to banhammered, I'll post it there too.
Some good tips on this thread, saved for later.