Why Adversal or CPALead changed referral rules?

I am wondering why they changed terms and if that change is legal. If they once had in terms that referral commission is life time and now they change it than it mean they broken first rule... that new rule should be applicable to the new referrals only I guess.
Anyway they are making big mistake with this... I am sure they noticed big savings in referral commissions but also not many new referrals.

This way you can make much more than with other "pay per install program" using similar content protecting gateways.
The benefit is that there are always new offers so also repeating visitors are counted and also visitors from all world so you can convert almost any traffic.
The diffrence of Adversal or CPALead changed referral rules.