Legal Interstitials Which Redirect Users May Block Google
If you have a legal interstitial, such as an age gate, which redirect a user to a different page and set a cookie, Google will not be able to crawl and index the content. You can use an HTML div overlayed on the page, or use JavaScript to load the interstitial so Google can still see the normal content in the HTML. If you need to redirect a user to a different page, then you could create a different page with content which doesn’t need the legal approval.
30 Nov 2018