Affordable is a relative term. I can name three people off the top of my head, two that I know personally, that own copies of the 50-1000.
Most networks, ESPN included, don’t own their own remote production equipment. There are several companies out there that handle most of it for most of the networks remote/field sports productions. If you’re watching the NFL, NBA, NCAA tournament, NASCAR, etc. it’s usually through either NEP or Game Creek.
If you see anyone shooting video on the floor from the NCAA Tournament, it’s CBS and maybe someone from one of the schools or conference. They don’t allow any local or other network tv photogs to shoot during the games. And the post game podium is usually a pool feed, as well.
The Fuji is in a different class than the Canon 50-1000. The Fuji is aimed at the “feature film”/commercial world, whereas the Canon is more toward wildlife, doc and sports. LOTS of them in the sports world.