The 'referral' system has not changed, maybe you were referring to the 'next buyer bonus'?  which did recently change, as the bonus maxes out at 500, whereas it did not do that initially.

The referral system, you sign up as an affiliate, you are provided a referral link, and you then encourage others to look at Latium, sending them your link, and if they click on your link, like this one,  https://latium.org/welcome/mfchiro, and you get a 5% commission in tokens of whatever they spend.  So far, I've only earned 90 tokens this way, but i'm happy with that.  I am not sure how long they will offer this referral reward, i hope it's a permanent fixture of the Latium platform.