Could also be a "cross-over", so your real account could mount certain parts of other file systems as an overlay. So if you could have a browser that would be the same across two environments. That way the throwaway account could be seen as real, but it wouldn't show things you don't want to be compromised.
That won't mask your online interaction history etc.
Maybe an LLM agent posting crap at random? lol
Could also be a "cross-over", so your real account could mount certain parts of other file systems as an overlay. So if you could have a browser that would be the same across two environments. That way the throwaway account could be seen as real, but it wouldn't show things you don't want to be compromised.