Since they are using the infrastructure of Mullvad, what's the point of using Mozilla's software instead of using directly Mullvad's ? Price related I'm paying

Since they are using the infrastructure of Mullvad, what's the point of using Mozilla's software instead of using directly Mullvad's ? Price related I'm paying 5€/month for Mullvad and Mozilla's VPN is at $4.99/month so when it will be available in Europe I expect it to be 4.99€. If they where offering something more, I'll see the point, but here by them developping their own software to use someone else infrastructure seems to be a huge waste. If they wanted to put their Mozilla logo, they should have gone for a white-label product with Mullvad no ?