Trying to clarify a bit
White label: this is just a synonym for promo (i.e., a promotional recording). the name obviously stems from the generic white label on the vinyl holding the audio.
Bootleg: a pressing (or, more generally, recording) not officially released by the artist. In the old days, bootlegs often just contained the same music as some rare and out-of-print EDM record.
I think you are referring to a specific type of bootleg, namely a bootleg containing edits/remixes of song. Actually, you might not even want to call it a bootleg. It's more akin to publishing stuff that extensively samples other people's work without prior authorization.
For example, these days, there's some chatter about an unauthorized edit/mashup of Paperclip People's "The Climax." Carl Craig seems to be upset about the issue and has reacted in a number of ways (on Twitter and Soundcloud).
My personal opinion is that unauthorized edits are fine as long as you're not using them to make a buck. If you're make money with your edits, I feel the original artist should receive part of the revenues.
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