I was interested in the countries in bold that have been listed as officially recognizing the passport.
The wikipedia page (which lists this passport as a "fantasy travel document") is skeptical:
> "The World Service Authority website has scans of letters dating from many decades ago from six countries (Burkina Faso, Ecuador, Mauritania, Tanzania, Togo and Zambia) which the WSA claims is legal recognition of the World Passports. "
> "These letters of recognition are several decades old (i.e., 1954 for Ecuador, 1972 for Burkina Faso, 1975 for Mauritania, 1995 for Tanzania, 1983 for Togo, 1973 for Zambia)"
Also notably, of that list, Burkina Faso and Togo border each other, as do Tanzania and Zambia (though the acceptance dates don't line up). In the cases of Ecuador and Mauritania, how acceptance happened on one side of each of their border, but not the other, is left as an exercise to the reader (and this reader is inferring that they were refused—but both of those nations have large, porous borders, so there's any number of possibilities, many of which illicit).
The wikipedia page (which lists this passport as a "fantasy travel document") is skeptical:
> "The World Service Authority website has scans of letters dating from many decades ago from six countries (Burkina Faso, Ecuador, Mauritania, Tanzania, Togo and Zambia) which the WSA claims is legal recognition of the World Passports. "
> "These letters of recognition are several decades old (i.e., 1954 for Ecuador, 1972 for Burkina Faso, 1975 for Mauritania, 1995 for Tanzania, 1983 for Togo, 1973 for Zambia)"
https://en.m.wikipedia.org/wiki/World_Passport