I haven't been following this closely, but it sounds like FUD to me. Ubuntu has Amazon search integrated into the dash. Queries are routed through Canonical's servers, so there's some privacy concerns, but I don't think they're selling that data to the highest bidder. It's just a referral link so Canonical gets a bit of money. That search function can be easily removed if desired. It's no big deal if you otherwise like Ubuntu.
Partial correction. It looks like they send anonymized search terms to third parties...
Originally Posted by Ubuntu TOS
Unless you have opted out, we will also send your keystrokes as a search term to productsearch.ubuntu.com and selected third parties so that we may complement your search results with online search results from such third parties including: Facebook, Twitter, BBC and Amazon. Canonical and these selected third parties will collect your search terms and use them to provide you with search results while using Ubuntu.
If you want to support Ubuntu, rip the ad guts out, and send them a few dollars, or buy some crap from them. Free software doesn't come without cost. If you value a project, consider supporting them. That can be with code, translations, quality bug reports, or money.