Hey,
Every big football tournament my group chat turns into a mess of everyone claiming they know who's going to win, so for this world cup I built a website where you can predict all the games and goal scorers.
It's a simple website where you create a private pool, share a code with your friends, and everyone predicts the scores. One thing I added that I haven't seen much elsewhere: the pool creator can customize the point system. So you decide how many points an exact score is worth, or just getting the winner right, whatever your group prefers.
Leaving the link here in case your group is looking for the same thing. And if you do check it out, I'd love to hear what you think. Still improving things so any feedback is welcome. playgoalcomp.com