(I know ... for business reasons ... but isn't Chrome open source? How is this in practice prevented?)
I guess the only difference is that with this change, DDG is available as a search engine by default with a blank install, even before you've actually used it.
You go to Settings > Manage search engines > Add or pick one of the auto discovered ones. This also works in the mobile versions of Chrome.
You can find more instructions here: https://support.google.com/chrome/answer/95426