Odd that 2 large companies that are getting into crypto are having other people do the back end heavy lifting.
Not at all! It's rather wise from the mainly three points,
1. Cost
2. Security
3. Infrastructure
Any big business will always prefer a third party before jumping into a very new technological landscape. Because they required someone to do the ground job while they themselves indulge into marketing and drive revenue. It's just sensible business decision and also helps limiting the risk exposure.
Highly unlikely to happen! Because when organizations enter such kind of partnerships, there's usually a non-competitive clause included based on certain key performance indicators (KPI). If these KPIs are constantly met, the main organization simply can't exclude their partners and start their own operations. That's usually how such partnerships work.