Open redirects are also used to prevent referrers from propagating through. In that sense, they're very useful for anonymisation.
there are many browser extensions to spoof or disable your referrer
Open redirects – a vulnerability class no one but attackers cares about
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Re: Open redirects – a vulnerability class no one but attackers cares about
#42Earlier quoted context omitted.
That might not be an issue for Google, but I could see it being a big problem for a company that relies heavily on projecting a "family friendly" image (think Disney).
Back in the day you could change some URL parameters and make it look like Toys R Us was selling firearms on their website because they used the same ecommerce back end as a sporting goods store. Like you'd go to the URL and it would be a hunting rifle (or whatever) but it would be on the Toys R Us site. I don't think Toys R Us was ever harmed but it was mildly amusing and I'm sure a few people's panties got knotted…
Re: Open redirects – a vulnerability class no one but attackers cares about
#43Earlier quoted context omitted.
there are many browser extensions to spoof or disable your referrer
The point is for the site owner to prevent it from showing up in the referer logs of other sites, regardless of browser.