I guess it depends on interest, I like science so there are a lot of science accounts on here, which for me is cool. As for sport, I am involved with my local UK based american football team, but the team is not on here officially, I just post stuff relating to the team.
I am following a few NFL teams. I am not generally interested in soccer, I have training on Sunday, this clashes with the world cup final, which I may be able to get updates on during training. I mostly follow science stuff.
It is difficult to build communities around something unless there are a LOT of people interested in that topic.
Give it time, we may get more sport here, but be warned, there are players in the premier leage who are black, they get a LOT of abuse from racists, So if soccer teams move to fedi, the some fans will follow BUT the racists may be the unwanted baggage that comes too. This is going to prove more work for admins.
This abuse is probably not just limited to soccer, other sports may have similar problems, and it is not JUST racist, we could end up with mysogamy to contend with too.