It depends on your plan.
If you're on the free plan, we keep 30%. The reason behind this is because of platform licensing, deliveries, staff payments, and many other things.
If you're on the Paid Plan we keep NOTHING! We introduced a paid plan to allow artists/labels to be able keep all their royalties without any fees being taken. Our paid is only £12.99 a year and you can sign up for that plan here.