Comment by graemep
I think that is often the perception, but is usually mistaken.
Smaller providers tend to have simpler systems so it only adds to ramp up time if you hire someone who only knows AWS or whatever. Simpler also means fewer mistakes.
If you stick to a simple set of services (e.g. VPS or containers + object storage) there are very few service specific nuances.
They also have the risk factor of leaving the market entirely as well, and you having to scramble to pick up the pieces.