What is this useful for beyond a convenient aid to evade IP-based abuse detection, "safely" trolling in general, and superficial comfort to a paranoid mind whilst browsing something like an xchan site?

(I'm curious because these are the only practical possibilities which come to mind, feels like I must be missing something)

Edit: To hopefully clarify a bit, I think this sounds cool and all, and it's dumb Google classified and shutdown this need as #wontfix.

I fully accept the shortcoming in understanding the legitimate use cases is completely on my end :). Genuine curiosity, not trying to rain on you in any way, @p1mrx.