Because FB went ahead with it anyways I'm guessing they assumed they would win any court conflicts about this but wanted to not have to deal with that and offer

Because FB went ahead with it anyways I'm guessing they assumed they would win any court conflicts about this but wanted to not have to deal with that and offered a lower amount to buy it than what court would cost. It's not that they think it was valid but that they just didn't want to bother. FB has the money to fight it and win anyways but it they'd rather spent $5 over $10 for example.