I never quite understood why these ransom-ware attackers restrict themselves to a small subset of the MSP's clients. E.g.: The SolarWinds attack affected only something like 1% of their customers, when it could easily have been 50% or more! If you're evil and out for money, wouldn't you want to cast the widest net possible? Similarly, by encrypting a huge number of corporations concurrently, you'd "exhaust" the abili…
Also you want the company to stay in business so it can continue generating revenue to extract future ransoms, and not have it lose a bunch of its customers from your repeated attacks.