I am certain this is not what the fans will enjoy.
SEIU is a crypto-communist organization well to the left of the teachers union.
If they manage to be the representative organization for the players they will slowly strangle college football into being just a bunch of minor league franchises perpetually on strike for contracts that only benefit the union bosses.
Link: https://apnews.com/article/dartmouth-union-ncaa-basketball-players-2fd912fade62ffd81218a6dc91461962
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Odds are, someone promised them oodles and oodles of money, and that joining the SEIU would get that money.
Maybe there is some money to be made, but as you pointed out, only the lawyers and union bosses are going to see that money.
Out of all the labor unions, they chose one of the absolutely worst ones...
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They deal with service workers, and nurses are their prize pig.
I wonder if they could join SAG or get SAG to represent them.