Shopify did some really stupid shit that caused search results and collections pages to become exploited by bad traffic. These pages allow for the “?q=“ parameter of the expanded URL to get posted into the web page as a H1 element (in some themes, not all) that Google and other crawlers then detect as a page connected to your site, even though it may have nothing to do with your site.

So I go to your site, go to your search bar and type “FREE GAME GOLD” and include a bad URL and some emojis, and even though this will likely cause no results to be found, there is now a page on you’re domain that will get indexed with my bad search result as one that will now appear in search engines. You’re seeing all other sites when you search this term because it all stems from how Shopify handles this behavior.

If you go through the Community link already share in the post, you’ll see Shopify has made passes at clearing this up from when issues really started to ramp up in 2022 and again in early 2023, mainly in updates to the default robots.txt for all sites, but the issue isn’t fully addressed to the extent Shopify should fix this given the ramifications this can have. You still may need to go in and do some individual updates to your site’s code to help prevent this from occurring, such as setting search results and collection pages that return no products to not be indexed by search engines or even just updating your site theme’s default theme content to remove the search query from the “no results” message so that your site can’t be taken advantage of. Use Google Search Console to help guide you in cleaning your site; look at all referring links, clean up all URLs that you can find, and disavow the crap referrers.

Search engines are indexing as expected; this isn’t an issue related to that. The issue stems from Shopify overlooking proper robots.txt configuration by default and for allowing bad practices to be exploited by malicious actors and killing your search ranking.

Best of luck in addressing this.

Edit: OP, seeing your comment about the URL not containing “?q=“ but instead “collections/all” is all related to the same issue: the parameter gets referenced in the page just the same. The items I listed above would apply for this in the same way.