Personally don’t see much use for these cloud IDEs as I already run Linux and have a decent desktop machine. One use case I could see is enabling folks without Apple hardware to do iOS/Mac development but none of them seem to have Mac hosts. I’m aware that Apple places certain restrictions on Mac VMs, so maybe it’s not possible. Feels like a gap in the market if it is though.
P.S. I’m aware of Mac Stadium, EC2 Macs etc. no need to point them out.