There are also a lot of 7D Mark II shooters using them for youth/high school sports with, at most, an
EF 70-200mm f/2.8 L (IS/IS II/IS II). There's probably far more of them than the number of 7D wildlife shooters. It's just that the sports guys aren't on forums like these. They're spending all of their time on social media trying to sell images and getting several thousand images a week up on their SmugMug or Zenfolio website. (At least they were before the SARS-CoV-2 virus hit.)
Some even use third party 70-200/2.8 or
EF 70-200mm f/4 variations to reduce costs. The economics of youth/high school sports does not really support the cost of a fast FF camera (1D X series) and an EF 300/2.8 in addition to a 70-200mm f/2.8 for when the 300 is too long.
7D Mark II + EF 70-200mm f/2.8 L IS II = $3,800
1D X Mark II + EF 300mm f/2.8 L IS II + EF 70-200mm f/2.8 L IS II =$13,500
Even
5D Mark IV + Sigma 120-300mm f/2.8 S = $6,200+ for the first 3+ years the
5D Mark IV was on the market.