Urbit was 100% designed with cloud in mind, listen to the inventory... he just hoped that "confidential computing" would solve the trust issue... which at least Signal agrees with, but if you want to be a purist, it doesn't help that much, you need to trust the chip designers and other assumptions.

Laptops get closed often, fighting the cloud is not viable, but we can make all data E2ee so that the compute happen on your machine but data availability is handled by the cloud.