That's their monetization. They don't have to sell advertising because the submissions are worth real money alone. I do a fair amount of work in the legal space and these deceptive tactics are really disappointing to see. I'd name some of the top offenders of this but I rather not give them anymore traffic and signals for google. If you're funded by lawyers or are a lawyer yourself please just say you are without the fog of a non-profit community driven platform.

If that's not the case with these sites (no way to really know what sort of handshake deals were made but I'd be surprised) I wish you the best of luck.