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DVC agreement forbids commercial renting. Disney doesn't define commercial renting, but lists having a dedicated website as one indication of commercial activity. So, pretty much any website you find will be in violation of DVC terms of ownership. How trusted can such a site be?
There's only one truly trustworthy place to secure DVC lodging - from Disney. Anything other than that will be somewhat more risky. Personally, I found it to be a risk worth taking before I bought in - but if you aren't comfortable with any risk, just go to Disney.