You can earn rewards if you refer people. You can also stay with them for a year then its $1 off a month and then $2 off a month after 2 years. Also commenting and helping out the community on here - answering these questions.
Yes if your referals switch to Koodo, you will no longer recieve that money. They are trying to offer you good plans to switch so that they can shut down Public Mobile and then get people to buy there expensive plans.