Do keep in mind that the comments on the soccer threads are also likely to be from bot accounts, but I’d expect that as more people start subbing to the community, there will be more “organic” participation.
As for the inclusion on the bot on a lemmy.world community. Please get in contact with the community mod, but I really doubt that the instance admins would be interested. If they don’t go with it, I might set up a Lemmy instance specific for tennis (matchpoint.zone was available for cheap. ;)