I saw that also Phantasy Star Online uses a Cloud version for Switch in Japan. So Capcom, Sega and Ubisoft seem to use the same service. You seem to have more information if you say that they use a chinese company. Any pointers for more infos?
The company is called .. Ubitus. PSO2 and RE7 uses them. AC I believe will also, just cause Brotherhood does as well. DQ10 is the same. But there is some service called g cluster which SE used before, and Konami too. But Ubitus seems to be the main player