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No, it isn't. It's so far from CC0 it's ridiculous.

It has no explicit right grant at all, no disclaimer of warranties, blah blah blah blah blah.

(i've been through all the issues before on hacker news)

The difference being that large bureaucratic organizations need an army of lawyers to approve the use of open source libraries, and using a common license that is already understood (e.g. CC0) will result in a far smoother experience when the developers in that organization try to use anything to make their miserable lives a touch nicer.

source: I have formerly lead one of the described miserable lives.

No, it isn’t. WTFPL isn’t even valid in lots of countries