Francis Ngannou has a Youtube page

[Pancake Sprawl]

A lot of MMA fighters have Youtube pages these days.

Wonderboy
Masvidal
Chad Mendes
Borrachinha opened one and is uploading this with content
Josh Thomson has a podcast with Big John

I think Chael was the first one who took it seriously and started to upload regularly. He is for sure making 6 figures at year with his channel.
Wonderboy is pretty good too... it reminds me a lot of Joe Valtellini (canadian kickboxer).

don't forget Overeem. his Reem series was some of the first MMA related content that got a lot of exposure on Youtube.