So I have looked at the ranking of Wilder's opponents, and the fights they had to get them their based on the WBC top 40 rankings of the time. It makes for some ugly reading:
Wilder #C - Chris Arreola #9 (July 2016)
- Arreola #13 – Kauffman #unranked (December 2015) NO CONTEST
Arreola #13 – Fredd Kassi #unknown (July 2015) DRAW
- Gerald Washington #14 –Ray Austin #unranked (July 2016)
Gerald Washington #18 - Eddie Chambers #unranked (May 2016)
- Stiverne #4 – Derric Rossy #unranked (November 2015) - This guy had a record of 30-10-0
Stiverne #C – Wilder #1? (January 2015)
- Ortiz #2 – Daniel Martz #unranked (December 2017)
Ortiz leaves Eddie Hearn (Matchroom)
Ortiz #unranked – Dave Allen #unranked (October 2017)
Ortiz #unranked – Malik Scott #unranked (November 2017)
- Fury #7 – Francesco Pianeta #unranked (August 2018)
Fury #unranked – Sefer Seferi #unranked (June 2018)
It really looks like the WBC having been using their ranking system to legitimize Wilder's opponents since at least 2016.