There’re abundant virtual systems available on web browsers for previewing purposes i.e. RebornXP and VirtualXP. Since FydeOS is so light in RAM occupation and has rather low requirements on hardware, it is possible to have such one for online previewing.
Yes of course it’s possible, but we have FydeOS VM for this very purpose. Like you said, it’s for previewing only, it’s like a toy. We want to dedicate our limited resources to making something that is actually useful.