OK, I've just checked the "Compare us against other remittance providers" section on Rebit:
https://rebit.ph/compareThey're not charging any service or exchange fees (total fees: zero). Anyone know how do they make money? Is this info misleading?
"How it work" shows this:
Depending on how you want to receive your money, additional service fees may also apply. These fees are paid directly to the provider you select. For example, Cebuana Lhuillier cash pickup will charge an additional PhP240 for a PhP10,000 transfer. Meanwhile, a bank account deposit within Metro Manila is free. As you fill in the rebittance form, the pricing display on the sidebar changes to show you what the total cost of the transfer will be.
So fees (if any) are payable to 3rd party providers. But what's in it for Rebit? Are they getting % of fees (affiliate system)?
Edit: @Newar - thanks for the answer