My take on this one is that if you've got a lot of spare money and you want to get into this, it's just all about satisfaction and getting the certificate unless you want to apply for jobs related to Bitcoin and related to blockchain technology.
Two questions come to mind here. First is whether companies hiring "blockchain experts" require such certificates or care if you have one or not. Second is whether these hiring companies even recognize the issuer of such certificates!
I believe this kind of certificate is useless.
I have this certification, I was approved in this exam by 2018 ( It already expired). Aa company paid for my exam, otherwise I wouldn't take it.
One thing that is interesting about this certification are the people behind it: Antonopoulos and Vitalik Buterin (he was when I took the exam, but I believe he left).
I wouldn't do it again, only if someone paid me to do it or to have it.