So it's very interesting to see it. Google explained that all types of reviews are affected, including single product reviews, product listings under review, services under review, and more. Additionally, sites with many UGC reviews may also be affected. Based on my analysis of product review updates, I see that all these types of sites and content are affected. I'll have more on this soon. After the announcement, I asked Danny Sullivan if the update would be rolling out as a big base update (every few months), or if the site could see improvements as they improve their review content and the site as an all-in-one.
Updates need to be refreshed regularly, Danny explained, and we may not be notified when it happens. It is very important to understand this. If you are affected by an update, you should work to improve the site and content over time and wait for the update. You may not see much improvement until this refresh happens. There are currently regular refreshes. Unlike major updates, given the Industry Email List more limited nature of the content covered here, we may not always release refreshes when they occur. So in general, sites should follow the advice and keep working on it (the same goes for major updates!) Also, John Mueller explained in the Search Center hangout,
He wouldn't be a little surprised if the algorithm made it into the core network rankings. This is just another reason to address the situation now and try to improve your website significantly. Here's a video of Google's John Mueller explaining it