I wouldn't expect the value to be all that high, but likely more than a few hundred grand. We don't really know the revenue, but we can assume pretty safely it is cheaper per team than an employee would be. If we just guess 20k per team per season with 15 teams, that's 300k. Figure 35-50k in ad revenue, we'll do 50k to be generous. 350k. At a 3x multiplier that is 1.05m. If that amount is 15k and 11 teams with 30k in ad revenue, we're a shade under a half million.
I can't see them being bought out under 3x revs... but can't see higher than 5x revs despite a very low overhead business with high profitability just because of the TAM. Now if their NBA spinoff is a part of it, that likely also has value and a slightly larger TAM than CF simply because there are more revenues and the cap is more complicated.
TLDR, I'd expect the CF (not NBA spinoff) buyout to fall in the upper end of the 500k-1m range. If the NBA spinoff is included add 150%.