I definitely was looking at porn on my 240x320 Nokia screen.

Their primary use is enterprise not private consumers. Think of virtualized OS accessible over internet that you can manage/protect and provide for example to some random consultant. Or just provide more powerful PC on low end HW.

It’s costly though and not sure it ever gained traction because there always were alternatives like Citrix Desktops.

And what will be the host from which you will run Cloud PC? Linux, macOS?