Well, seems like big bullshit.
Why would you need this certificate ?
It does not prove anything.
You may not need it personally, but I assure you employers need it so they have a trusted measuring stick they can look to. Imagine being a hiring manager told to get somebody on board who "knows the blockchains", how do you as a candidate convince that person you know what you're talking about when they don't understand a word. In another use-case, how do you convince your insurer that the people on your staff have the qualifications they say?
Not everyone agrees with certifications regardless of industry, but they absolutely have their place.
We're volunteers running a non-profit organization trying to help mature the space. If it was bullshit we wouldn't be wasting our time.