No, it goes the other way around. They have established themselves as big players first, by having best telephoto lenses around (and bodies too!), and THEN people flocked.
If I designed 40kg, 1m long 600mm f/4 "supertelephoto" that has to be manually focused, no IS and no possibility to do shutter priority (stop down quickly) and cost better part of 30K nobody would buy it, Canon or Nikon labels notwithstanding.
Those are completely separate markets. Noone uses their Canon 600/4 to observe super close double stars, neither wildlife/sports pro's lug 6" Astrophysics or Takahashi APOs on ME-II's or 1600's around. Even if they are much sharper and much more stable.
Apples and oranges.
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