Creating supporting pages to drive more organic traffic and improve search engine positions can be a useful strategy, particularly for larger websites that cover a variety of topics.
In the example you provided, creating a separate page devoted to a brand's casino app and linking to it from the review page could make sense, as it allows you to provide more detailed information about the app without overwhelming the review page. This approach can also help to increase the relevance and depth of your website's content, which can be beneficial for SEO.
However, it's important to ensure that the supporting pages are still relevant and useful for users, and not just created for the sake of adding more content to your website. The supporting pages should provide unique and valuable information, and should be optimized for relevant keywords to help drive organic traffic.
In terms of consolidation, it really depends on the specific situation and how the content is structured. In some cases, consolidating similar content onto a single page can be a good strategy, particularly if it makes the page more comprehensive and easier to navigate. However, in other cases, having separate pages can be more effective, particularly if the content is significantly different or serves different user intents.
As with any SEO strategy, it's important to test and monitor the performance of your supporting pages over time to see how they are impacting your search engine rankings and organic traffic. You can use tools such as Google Analytics and Google Search Console to track changes in traffic and rankings, and adjust your strategy as needed.
