Earlier quoted context omitted.
They never gave out personal information, they just covered your dash with ads and clicking them gave Canonical affiliate revenue. They routed the searches through their servers to prevent Amazon from associating searches and IPs when they go to the actual site. And I (think?) this is the release where dash ads are default off.
They send to Amazon what you type. And default was always on. And in latest versions option to disable was removed, you had to remove one package because "Ubuntu is about simplicity"
Nope, wrong way round. After the - er - strong reaction to the original appearance of the Amazon feature, later versions had a kill switch under Privacy. It was always possible simply to uninstall the appropriate package.